Disagreed, ruin has little to no use at level 60 (Although ruin 2's insta cast still has it's merits if you need to move but don't need to refresh bio/aero). The only time I'm ever hurting for MP as SCH is if I'm spamming blizzard 2/adlo/succor or *really* being stretched for single target healing (aka the later half of A2S). Energy draining whilst pushing dps easily offsets Broil's inefficiency even on encounters where I'm often spamming broil rather than refreshing dots (aka Ravanna).
SCH dps is more about dots than nukes, broil simply follows that trend.