I've also noticed a lot of tank-turned-dd who loves to interrupt/stun/silence those AoE casts.
Please don't unless it was meant to be interrupted.
You know it as well as I do that we rely on the cast to finish properly so the target doesn't turn. Silencing or interrupting something will cause the mob to "snap" towards the tank.
Besides, when the mob is casting something it is not attacking the tank. So choose when you stun/silence.