Add in shell as a short term instant cast party wide 30% magic defense with say... 120-180 sec cooldown. This way we can sill have the passive protection of protect as a long lasting buff, while shell can come in as a healer action for bumping up the defense of everyone prior to a nasty raidbuster. This also means that both protect and shell has a use as a role action without overlapping or forcing a case of you always choose one over the other for a given piece of content.

Oh, and also return Esuna/Leeches/Exalted Detriment as being inherent to the healer classes. So I can stop seeing cases of going into O4 and seeing people die to doom because the healers did not think it was necessary to bring esuna.