All over this subforum, the most common response to any, ANY request for ANY change, no matter how small, is this idiotic slippery slope argument of:
Please educate yourself:
https://yourlogicalfallacyis.com/slippery-slope
Is it impossible to make just one or two changes? If you change one thing, then EVERYTHING else *MUST* change, 100% guaranteed? The problem with retail was not changes themselves, rather, that Blizz changed too much and didn't know where to draw the line. Most, if not all vanilla players liked TBC, even though it had a shitload of changes from vanilla. So why is it such a massive sin to make any little change to vanilla?
No, adding in minor QoL features like AoE looting will not lead to "LFR, flying, heirlooms, instant 60" or any of that bullshit, and such minor QoL features will not affect the "feel" of the game or whatever other emotion-based argument you want to use. I dislike retail as much as the next vanilla fan, but there are plenty of GOOD changes that retail has made, that would be very useful in vanilla.
Furthermore, addons in vanilla already add a fuckton of QoL, yet you don't see anyone advocating that those are "not vanilla" or that they should be removed. Vanilla was full of addons, specifically because players weren't satisfied with the game's base offerings, and wanted to add things to improve it. Things like LazyPig automating tons of things, or EzDismount, which auto-dismounts you when you try to cast a spell, movable cast bars, better unit frames, chat modifications, easy dispel addons...players have been making their own QoL changes to the game ever since it released.
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Point is, please come up with actual arguments for why a change is bad, instead of just plugging your ears and screaming "NOT VANILLA!" or "SLIPPERY SLOPE!".