The false dichotomy is already proven. There have been numerous, some very successful and well loved, expansions between Classic and current Retail, all of which constituted changes to the previous expansion. OP suggested that there can’t be a happy medium due to the slippery slope to retail, meaning that the game either exists in his perfect/all good state(Classic) or all bad state (Retail). The other options here are the factual reality that:
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This game is not Vanilla and never can be due to the client. Blizzard has also made several changes to cut down on griefing, such as flight master respawns and aggro range (off the top of my head). One look at the bug report forum shows how far off base this game is from Vanilla.
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Quality of life changes can be made without the game becoming BFA. A constructive conversation would include discussing what changes are reasonable. A constructive conversation does not include using fallacy to attack anyone who think that certain QoL changes would make the game more enjoyable. OP is welcome to think the game would be most enjoyable without changes and to express those sentiments. His arguments are poisonous and should be treated as such.