Bug fixes are about the only QoL "changes" I could be fine with.
Leave classes and specs as is.
Leave quests as is.
LEAVE EVERYTHING ELSE AS IS.
Stop wanting to ruin vanilla. You don't realize trying to "balance" everything will turn the game into Legion.
Imbalance is part of vanilla. Imbalance made it fun in many cases and interesting.
You want to play a Ret or Enhance? Understand you might not be the best in a raid. Can still be useful, but not topping meters. Have a blast in PVP though.
Stop demanding to be a special snowflake. Not every class needs to be 100% balanced and perfect.