Everytime I look at Physick I do wonder if they're seperate spells too:

SUM: 400 MP, 400 Potency, under Class
SCH: 400 MP, 450 Potency, under Job

Regardless, that it doesn't scale with Int, or have an upgraded Phoenix-type variant, means it can be safely taken off your bars and forgotten about. Just put Carb's shield there instead.