because you mention prepatch, nothing like how.
TBC to unlock sunwell had server wide time gate
to unlock AQ was a massive time gate of the player base needing to hand in resources
ICC with a wing opening each week
wotlk how there was differant phases
legion prepatch how you needed to wait to do the broken shore.
Could even call the TBC attunements gating to an extreme extent "want to do this content, gotta do ALL THIS OTHER STUFF first, no matter how geared you are"