This is nice in theory, but just isn't viable. The game has strict dps checks. I can speak only for my static, but when taking on a new member we would require them to bring a certain amount of dps, say 1400 from a blm (number out the air). As long as they can hit this, HOW they do it is not important to us. If they can somehow manage to magically hit this number by spamming scathe, then more power to them. But the game is designed in such a way that sticking to the set rotation is the only way to really hit the required number