Level 80s who single target groups of mobs

[SnowVix]

OP states " Explain to DPS that on about 3 targets, it'd be better to do AOEs". This is wrong. It's better to do single target rotations on very small pulls consisting of 3 or less because you can burst down them faster then using some weak AoE skills. Single target rotations of course have higher DMG potency than AoE.

the only class where ST is a gain over AoE in the 3+ range is monk. and even then it's a mixed rotation, as at 3 you want to use Arm of the Destroyer every Opo-opo GCD (unless you have a Leaden up from the last enemy), Four-Point every Raptor GCD, and Demolish each enemy in turn. At 4+ Rockbreaker beats spreading Demolish. And for your example of MCH, Bioblaster is better than Drill at 2, Flamethrower is for 3+, Auto Crossbow is better than Heat Blast at 3, and Spreadshot is better than Heated combo at 3.