There's an entire community out there for theorycrafting. The moment they change something, they'll do their testing and figure out the new meta. If stacking determination is suddenly better than crit and increases your DPS by 0.1%, people will dump crit and go with determination instead.

Same thing when they change anything. People figure out what the new best gear/rotation/melds/strategy and everyone mimics that.

I almost miss the early days of MMOs when all of this information wasn't readily at your fingertips. There was more mystery to the game. But, who am I kidding? I don't have that kind of time anymore.