The thing is, it would fit dancer really well, yes.

But what if other healers had something with TP and each healer has a different effect with it?
Like i said, i wouldn't know WHAT sort of effect, but TP is pretty useless for healer so why not make them able to have abilities, that use TP
Or sacrifice TP if you want to call it so to give the team/1 person a cool little buff.