The amount of times that Firefall triggers, when the boss does some charge or run mechanic, and the meteor completely misses the hit zone, is more than I can count. It feels really bad to Have to take this talent for damage purposes, yet not have a guarantee it will actually do damage. I certainly am not willing to stop my rotation of casting fireballs and Pyro blast To wait for the boss to sit still.
Meteor, on the other hand, can be targeted, As well as delayed so as to guarantee a hit.
Would it really be that difficult to make Firefall on the boss regardless if he is moving?