What discipline? The only thing you need to do as a raider is watch dbm timers and not tunnel boss, and let’s not pretend following dbm is hard.
“Oh look big aoe raid mechanic incoming, everyone move to the predetermined spot and use defensives”
It comes down to situational awareness and yes there are pvp addons to track things, but that is a lose basis of what that person is capable of, were in pve it’s not a question of if the boss will use an ability but when.