Rrrrright I read that you don't have all 3 macro'd, that still means you have 2 macro'd together, which means a .5s loss every combo. That adds up over the course of a longer fight, see: Turn 1, etc. Also I think you're not considering exactly how much time .5s is. If I mash on each one, I'll get my ability out significantly sooner than you would. Also, on top of that, if I hesitated to press the button then you'd be open to the same delay - which would be even more consequential for you.

But uh. Do what you want I guess. Just saying, it's not hard to press 3 buttons as opposed to 2 and you'll be at an advantage whereas having a macro gives you literally nothing but a .5s delay between the two hits. @_@