Interesting topic, and I want to start by linking this video which I find absolutely perfect as an example of what we would like in the game:
https://www.youtube.com/watch?v=77ctkfOVHp8
Now my opinion. currently, for the heroes who are here now:
something interesting around Symmetra’s TP. I think that if we improve that technology by making it a little more immediate… it will be from there that we can better decide its potential in the damage role.
More help for Lifeweaver’s petal platforming tech, it’s too easy to waste. Even just a small speed debuff to the enemies that pass through it would be enough.
In terms of technology
Clan System: I find it absurd that this thing has completely disappeared in development considerations;
A single player story mode. Sorry guys 
: PVE is not a replayable format (and blizzard has NO idea how to develop it, let’s face it) and the lore needs to have a good narrative to have its dignity in what the original old hopes on “2” were. Narrative DLCs would be enough (REAL DLCs, not that Invasion demo) like the narrative chapters of Starcraft 2: large narrative portions with many chapters… but good enough to provide a lore of the present rather than always leaving us alone. “Overwatch is back , oooh the talon is bad an… no one knows what it’s doing” 
A REAL collaboration with the community Workshop. Blizzard is literally making an even bigger mistake than the Warcraft3 mods made with DOTA (giving rise to the MOBA genre). Season 5 was a very bad opportunity for how little real assistance was given to a content creator in the workshop who could finally express a good creative choice… but they didn’t give him any type of polishing for that game mode against the demon king. It could have seriously been the beginning of an involvement with the modder community, and instead they continue to ignore them, generating bad disinterest in learning these tools in future players. There is so much potential in the workshop, and they don’t even bother making official tutorials on it. THIS is an unprecedented technological waste, even worse of PVE Talent Tree deleted;
significantly revolutionize the showcase of gallery contents from too many points of view: there must be specifications regarding the presence of special effects, being able to try out the skins in the training room and in the various poses / emotes of the game before deciding whether to buy them. An example right on Heroes of the storm game https://i.gyazo.com/2e4a700956e90e8b93a8b987b3f1aa7b.jpg: FX? Special audios in the skin? “skin features” section can say it for us. And above all there MUST be a button that redirects you to the purchase of the single item, since not everyone (especially those who don’t play Overwatch that often) knows how to orient themselves in the gallery;
On the maps I trust the style quite a bit, but I would certainly like the lore of the push maps to be better enhanced (here I give a more direct example). and a little personal feedback from me on the style of the Colosseum map 
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Other things:
Not necessarily in order of importance:
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Flashpoint maps:
I suggest a fairly soft but functional change for the type of mode, that is to put the exit speed from respawn which we also have in Capture the flags Blitz. In this way there is greater reactivity against enemies who are on the point in this mammoth map, and the further we are from the point, the faster we are while reaching it. The closer we are to the active point, the more the speed re-stabilizes;
if we ping the active point, a GPS arrow must appear on the ground telling us which direction to take with respect to where we are now. it’s a technology for orientation that exists in many video games, we can absolutely have it here too without necessarily dirtying the user interface with a mini-map;
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Events
Give a true cyclical nature to events. It’s kind of sad that a lot of people who started with OW2 didn’t know about the Archives. on the contrary, I find it really wasteful not to repeat the events of the various seasons in a cyclical way. why was there no Pachimarci last March? Why hasn’t the Loverwatch website been reactivated? for Valentine’s Day 2024? When and if the events seen in other seasons on the topic should return (battle of the beasts, defeating the demon king, etc.)?
It would be extremely good to propose the very old technologies from previous years of overwatch (sombra 1.0, symmetra support, etc.)… right on the anniversary. “arcade revivals” for those who are simply nostalgic. Diablo 3 does exactly the same thing with a special mode that simulates the first Diablo, why not do it with the technologies of OW2 with an arcade adaptation?;
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UI
Creating an interface with precise details on the heroes’ abilities and their numbers, I find it absolutely unprofessional that a competitive game is observed by a fandom wiki and not by the game itself;
obviously the teammates’ life bars somewhere in the UI;
Expand the spray, emote and audio choice wheel from 4 to 6 or 8 choices.
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Gallery:
a rearrangement of the contents and descriptions of the offers. there is so much disorganization that it is impossible to find your way around. It is necessary to include tags (even personal voicec we can incluide on items), search bars, etc. to significantly improve the search for what you want to have;
Significantly change the logic of pricec in recoloring skins: if I have a skin, make me pay ONLY for the recoloring. introducing a new rarity rule where you pay full price for the legendary skin only the first time… but you only pay the epic price for its recolor. For example, I’ll pay one of the 3 skin okami di hanzo… but the next oclors I wants I’ll pay it as epic skin. Easy, no?
A real minimum quantity for the amount of contents in the standard gallery when a new hero arrives. it’s scandalous to have seen a practically empty gallery for Venture on their debut 
;
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Shop:
Eliminate forever the logic of OW1 contents bundle at prices in coins in the shop. I find these types of OW1 offers dishonest, considering that they are also contents available all year round at the price of credits;
let’s definitively stop the market of fake Legendary skins: Moira Mime, Kiriko terrible tornado, Bastion gingerbread, Kiriko Hashimoto and Hanzo Hashimoto. it’s absolutely shameful, both for veteran players who saw the developers learn their lesson in 2016 with mei-rry skin, and for new players who are shamelessly scammed. the rarity cataloging MUST be 100% an indicator of the quality of the work of a skin, not of how much money you want to make in the shop: what is EPIC and what is LEGENDARY 
, ok? people HATE knowing that you think they’re so stupid.;
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Other details:
more precise patch notes. I know it’s a boring thing to write, but it has to be done. I hate the stealth patching;
more assistance in the lore-based information: In blizzard there is really little consideration in the spam of editorial products (especially in foreign localization), and nothing is done to resolve some inconsistencies that the community has been spreading for years (for example the age of kiriko inconsistent with shimada lore);
fix forum features such as changing the icon, but also expand their use with the game. why can’t we use sprays as available images, since they charge a lot for them in game now?
an in-game display of ALL the lore based contents visible online: articles, videos, comics, short stories… all well catalogued, and not just the latest published for the new heroes 8 currently only present for Kiriko and Sojourn pages). it can also be the perfect opportunity to update some (eham, cassidy old name) and to put ngame readings to pass the time with while waiting in line for the next match;
in the videos available in the invasion missions section and in some cinematics visible in game, a navigation bar (pause, go forward, pause etc.) it is stressful not being able to manage the display of the video. or worse yet, start it over again if it stops.
Yep… I have different types of opinions and ideas about everything.