I think they should redesign the damage dealers to have a "burst mode" where their attacks are visibly different than their normal rotations. Then make fights about taking advantage of weaknesses in the boss's defenses. That way, if a parser is added, it is easier to tell when someone is under geared or under performing. If they are not using bursts at the right time, then there is a visible clue as to what is going on.

It could also help them add new abilities without pushing the ability bar, since they could overlap the burst attacks with the base ones. It would give each ability two modes.