so you might have noticed how in tww with the way caster mobs work now; instead of before when you had to cooperate with the rest of your party to chain your ccs and stuns, mobs now immediately begin recasting after the stun/interrupt is over. even worse, caster ads will not move at all, or as much anymore. in higher keys this has more or less necessitated DKs in your group in order to grip priority targets and interrupt them from casting in addition to the usual spread of cc/stuns you need.
It’s almost like Blizzard is still trying to get players not to just “round 'em up and AoE 'em down” but still hasn’t addressed the timer, which is the biggest driver of that behavior.
Otherwise, CC’ing a distant mob would normally be a viable alternative.