I think that the reason for this skill to be elite is to avoid it being used together with other skills like may be Dwarven Battle Stance, distracting Blow or any skill wich causes knock down; may be, all of them together would be too much power of interruption against a caster.
By the way, mesmers are not the best at plain interrupting, rangers and warriors may do it better.
Removing conditions is easier than removing hexes, but conditions are easier to spreed than hexes. And removing them still requires energy and time.