Bg2 had class quests as long as the main charicter was one of these classes for paladin where you could run the paladin order,
druid where you could run the grove
Thief could run a branch of thieves guild
Wizzard could run the planer orb
Warrior got a keep.

I hope bg3 will do something similar it added a lot of replayability and flavour to making the world feel like a real living place.