Ok clearly I need to spell it out to you
Your claim is three fold, a) world buffs weren't intended b) because they would have trivialized raids so c) world buffs shouldn't be allowed
A) is debatable unless you were a dev that can confirm what they were thinking (although I agree that the peak autism min max world buffs weren't intended)
B) is also debatable. You even said it yourself because vanilla was about progression and learning encounters, so getting world buffs to face a boss you haven't got past 90% was pointless
C) players now know every encounter, every ideal spec, every bis item, every consumable. They min max in more ways than just raid buffs
IIf the argument for removing buffs is harder raids, then removing buffs is a lazy way to achieve that
A better classic plus would have re scaled raids and some class balance tuning