Won't happen, too arbitrary to decide "performance", people have different play styles, and there's way to exploit the system by taking advanatge of things. For example, Limit Break meter fills up largely when mitigating damage that would have killed you. So for O6, people throw shields up and would take all their gear off then put it back on (reducing their HP dramatically) then quickly pull Chardanook. He opens with moderate raid-wide AoE damage that would kill you all, if it werent for shields, thus giving you an instant LB bar. Technically that's good play to the game but it's an exploit.