I always put Foe up, even if all we have for casters in the party are the healers because it boosts their dps as well. My husband often plays scholar and I know that I know he's dps'ing whenever he can. When Speedflox was still a thing, I'd Paeon for myself for the AOEs.

I *have* been yelled at in dungeons before for not giving a healer ballad when their MP got to 1/2 because I had no MP left from having Foe up for the BLM. Can't please everyone. /shrugs

(And honestly, if I'm having to save MP "in case" ballads are needed for too many raises in raids? Prolly doin' it wrong there, people.)