Gonna take the time to write out what the potential impact of each of the requested QoL/retail features some people think the game needs so maybe they can understand why these sort of things are not wanted by others because of how they would change the feel of the game.
Transmog: yes you get to look however you want but you also lose the ability to look at someone and instantly recognize what lvl of gear they have and know where they got it. This may seem like a small change but it would have a huge impact. You can look at an enemy in pvp and be like “uh oh they are decked out in raid gear, better not mess with them”. it dillutes the meaning of your in game achievements
Dual Spec: If you can always be the best spec for any situation the game will need to be balanced around that. part of the casual nature of classic is the game isnt tuned to have the best talents for every situation so you dont need dual spec unless you have some kind of mental problem with always needing to minmax everything til its not fun. If your choices dont matter then you dont matter. youll have a lot of crap tanks who would rather dps rocking a tank spec just to get in groups faster too at which point no one wins, not you or the group.
Instant Mail: Not the biggest deal but it is currently a thing you need to plan ahead for instead of receiving instant gratification. whats so wrong with delayed gratification?
Summoning stones: Warlocks value in the game is instantly diminished and youll find groups you form begin arguing over who has to go to the stone and who gets to afk for the summon. at least now everyone knows they gotta run too if theres no lock or you arent doing the dungeon. Also by erasing the need for people to run to the instance youve just cut down on the number of dynamic world interactions on your way to the dungeon (PvP, Herb and mineral nodes, chests etc)
15-30 minute hearthstone: youve just shrank the world and added to the problem of less world interactions same as summoning stones. also contributes to mages and locks being less valuable with portals and summons.
More flight paths: maybe 1 or two could be added here and there but this also contributes to the shrinking of the world and should be done very carefully.
RDF/Raid Finder: Part of the reason the game became mindless is because in order for random groups to be successful the game had to become easier. AoE Tank threat became mindless and the whole meta became AoE everything as fast as possible as a result so people didnt feel like they were being paired up with a failure of a group (honestly this mentality has already seeped into the community anyway of AoE everything and forget mechanics which sucks). The world also shrinks because you sit in the main city and queue for dungeons and wonder why youre bored.
I’m sure I’ve missed some of the other QoL features people have asked for but the main point is this. Any one of these things might not seem like a big deal but all of them contribute to SHRINKING the world and making your choices within that world matter less.
CONSEQUENCES MAKE THINGS EARNED IN THE FACE OF SAID CONSEQUENCES HAVE VALUE! That includes the consequence of needing to travel across the world. The world is the main character in Classic WoW and is probably the major reason it is still loved to this day. Shrink that world and you shrink how much the game will be enjoyed in the end.