Your correct lock, the major issue with combat its self is stamina.

On paper it kind of looks like a simi cool idea but the only reason for it to exist is as a governor for how many actions/attacks we can do over a period of time. Here is the thing though its extraneous for the most part. you cant constantly do moves that require tp as tp is finite. you cant get crazy with casting spells for two reasons, while in combat mp is finite also there is another limiter in that if you do it to much the target comes over and smacks you. cant spam abilities there already on a timer.

I know that as a mrd i need to taunt and voke to keep hate locked for a bit. problem with that is well that leaves me with enough stamina to wack the mob about three times before im standing there like a putz waiting around to get enough back to do any thing. and all the while the other party members are pulling on the emnity strings. if some one yanks hate at that time there is absolutely nothing i can do and it sucks.