PLD also uses MP to a degree, although it's only really relevant if you have to resort to healing with Clemency in an emergency. In normal gameplay, your basic rotation + Atonement + Expiacion will restore anything you lose to your Confiteor combo.

I do agree that it would be nice if MP was relevant again, although I will also say that in this stage in FFXIV's development, it would feel like they'd only be doing it out of obligation.