Just take the MCH opener as an example. My friend often hits 23K WFs. WF is 25% of the damage he dealt so...115K total. 10% balance that is 11,500 damage, 20% is 23,000, enhanced 30% is 34,500. And this is only for the 15 second WF, whereas balance is 30 seconds. So if using a spread balance in a raid you're effectively doing more than 50,000 damage at the minimum. WHM can't really compete.