With the new Manaward shield ability and Phoenix Excogitation, Summoner Physick being trash is less relevant. You would realistically only use Physick during downtime anyway.

I am fine with Red Mage being the only caster DPS with a respectable healing spell since that is part of the RDM lore identity as a white and black magic user. Giving that to BLM or SMN means that RDM becomes less special.