Things have probably changed quite a bit since I was a WAR main pre-Heavensward, but I remember more than a few instances where failing to put up SP in time during early progression guaranteed that your lowest HP dps died to Megaflare. I understand that it's a 7 potency loss/GCD to SE/SP instead of a 3 potency loss/GCD for SE/SE when you're catching up on aggro, but when you have one of the most powerful raid wide damage mitigation abilities in the game, sometimes you just take the dps loss.

Hell, if you don't want SP, I'll take it back off you, thank you very much.