Upper_Krust
Legend
Howdy FireLance! 
You are still removing the tactical ability to choose when its going to be used. Also you are giving PCs the ability to know when such an attack will take place. Going that far you may as well make it explode on death like a Balor.

FireLance said:There is still an element of tactics involved: using Irresistable Command as an immediate action means that the pit fiend won't have a spare (or additional) minor action to use Point of Terror on its turn. So, whenever a minion dies, the decision will be between blowing it up now, or lowering an(other) opponent's defences on its turn.
You are still removing the tactical ability to choose when its going to be used. Also you are giving PCs the ability to know when such an attack will take place. Going that far you may as well make it explode on death like a Balor.