Well, here’s my opinion from a collector’s perspective. I will probably sound frustrated, and I apologise for that; I know it’s not your fault, or really any individual developer, but this is how I feel with the game right now. I promise I’m working toward the portals, but I need to frame this.
As a collector, it feels like my play style is at best an afterthought and at worst forgotten. The game’s reward systems seem to be based around randomly giving cool rewards for just normally playing other bits of content. That’s fine, but as a collector, who likes to collect things, every one of those “if you get lucky you might get a bonus reward in this pet or mount” becomes a “you need to do X to get Y”. It’s less a bonus, because those bonus rewards become what we seek. They’re what we look for.
Islands are one example. Theoretically they’d be a collector’s dream; 360 unique mounts, pets, mogs and toys to collect, so much stuff to do! But the abysmal drop rate, and the lack of transparency on that drop rate, makes it feel like collectors aren’t really spared much thought. We don’t run the island for Azerite and get happy when we randomly get an additional reward; we run the islands for those rewards, and at present the drop rates on both unique items and doubloons are so low many of us are becoming jaded with the idea of collecting entirely, or at least giving up on Islands for the expansion in the desperate hope we’ll be able to solo them a lot faster in the next expansion.
So if we decide there’s a piece of new content in the new expansion that will be easier to collect from in another expansion or two, we fall back on collecting stuff from older content. That’s fine. We can be patient, as long as rewards don’t arbitrarily vanish if we don’t do them in time; if it’s more efficient to wait a few years to go after something and get it years after it was the Hot New Thing, that’s fine. We’re okay with that.
So we go back to older zones to farm rare drops or older raids and dungeons for mounts or pets or mogs. In Legion we even had an amazing new quality of life improvement in Bear Tartare, which gave us a 70% speed boost when we killed something - this made running Molten Core a lot more fun than it is at walking speed. But when BfA came out, Bear Tartare was nerfed to the point of uselessness. I still hold out hope one day it might regain is original effect as long as the Legacy Loot Mode buff is enabled, to bring that feeling of fun back to grinding, but I’m not sure.
But when it was removed, that was another blow to collectors. I know it was probably removed because of balance concerns with new BfA content or PvP or something, which is why I think it should only have its effect back in Legacy Loot content. But the point is, when it was removed it felt like collection-focused players were losing a fun toy that made our pursuit a bit more bearable.
Moving onto the portals now.
Due to the aforementioned way the game’s rewards aren’t really designed for “collect all the things” as a viable end game, when we have less to do in a new expansion and thus want to go do old content instead, it tends to be a lot more effective and efficient to have multiple alts. A helm with a 5% drop rate once a week sucks, but if we have four characters a week who could learn the appearance it’s a little better. Collectors, I assume, would thus tend to have more alts than most other kinds of players - at least, more alts they tend to move around the world more frequently.
So, if a collector has more motivation to do old content than old content, chances are they wanna do it on a number of characters. Think about Icecrown Citadel. You want chances at Invincible, or Arthas’ swords, you have to make your way through the entire raid. Now imagine doing that every week, aiming for those drops, and then imagine doing it on five characters, or ten. The travel time increases horrendously, and that’s with a portal to a relatively close location. Imagine if, instead of Icecrown you wanted to farm Throne of Thunder. Then imagine if the Shrine of Two Moons in Pandaria, that portal was replaced with one to the Jade Forest - clear on the other side of the continent. Every time you wanted to run Throne of Thunder, you either set your hearstone on the Isle of Thunder, which is bad if you still want to do world quests or warfronts since we don’t have a hearthstone to Dazar’alor, or you make the agonising trip across all of Pandaria several times a week.
Yes, the world feels bigger, but it’s not a sense of wonder. It’s a sense of time being wasted. After five characters make the trip to ToT you’ve spent enough time auto-flying to have done much of another run of the instance.
The CoT portal lets us get to Hyjal or Dragon Soul or the dungeons nice and quick, but if we had to fly 10 characters a week over Uldum and Tanaris to get there… it’s a lot of time spent for no extra benefit. The world feels bigger, but it doesn’t feel more fun.
So that just adds to the feeling of collectors being forgotten again. It feels like every time a QoL change happens that makes our insane goal of collecting fun things in old content more tolerable or, dare I say it, fun, something else happens that removes that benefit or even makes it worse. There are enough out-of-the-way locations in the world we want to get to, and will want to get to frequently until we’ve finished 100% with it, that we don’t need more, currently convenient locations made more of a slog to get to.
TLDR
The impact on me of removing portals is in the order of potentially an hour or two a week I could be spending running old content being wasted just getting to that content, and the worse impact on me is a feeling that my play style just isn’t supported or even desired by Blizzard at this point - between the nerfing of Bear Tartare, the lack of conciliations on Island Expedition rewards and the apparent removal of some of collector’s most favoured portals, I feel like Blizzard would prefer I just focus on playing new story content as it comes out and then not playing until the next patch. If it’s too much effort and not enough reward to accomplish my chose end game goals, why should I continue? I chose to be a collector, and that’s given Blizzard a lot of extra mileage out of me for no extra effort - I’ve chosen to run old content a lot, especially in Legion - but I’m starting to feel like I should cut my losses and give up on that.