Flare is the exception, due to its high potency and limited use, not the rule. You could probably Flare single-targets and not have major DPS issues (I'm not a BLM, so I'm just basing off Flare's potency and knowing some BLM critting Flare over 2K)
ALL AoE (Flare and sometimes Holy, thanks to its potency and Stun, being exceptions) is bad below 4 mobs. Its just not efficient compared to single-target on 3 or less mobs. I'm also not counting Bane here, just because its, well, something else entirely (Bane all the things, please)
