WoW's classes were pruned for Midnight because many were 'built in a world' where its devs assumed they'd be using addons

World of Warcraft recently embarked on the massive undertaking of redesigning all of its many specialisations to work without the assistance of UI mods (addons) for Midnight—mods which previously automated a ton of the complexity of its classes.

As an outlaw rogue, for instance, I had an addon which told me when I should cast Roll the Bones, because the decision making of that choice involved keeping track of several separate, randomly-generated buffs that each did something completely different from the other.