If knights had defensive, would there be any reason to have warriors?

[Videri]

I don’t think so, no.

Knights get 5.2 hp per stamina, whereas warriors get 6 hp per sta. 6*255 - 5.2*255 = 204, a significant chunk. (And there is no softcap on stamina.)

But the snap aggro is significantly better than relying on swings and procs.

I think it’s a really cool game balance choice that the class with the very best hp and mitigation has slightly limited aggro generation, whereas the classes with on-demand aggro have slightly less hp and mitigation (and much less damage output). The end result is that all 3 classes are needed, and there are many ways to play.