The reason we healers DPS

[Deceptus]

The biggest thing to me is that, unless running an all-physical party as of Shadowbringers and thus having essentially infinite AoE, you simply cannot sustain an AoE in many a full pull without healer DPS or badly outgearing the instance; there's just not enough MP (or, formerly, TP).

And the other great thing about all physical parties is their access to Bloodbath which would enable healers to dps more if they actually pressed it.

Like if they pressed it now. . . oh wait. They don't.