Between Cover and Outmanuever/Divine Veil, I hardly ever run into MP issues. (On the content I've done.)

I know nobody likes using Ifrit as an example anymore, but for a PLD tanking and helping cure himself, I almost always end the fight with near full MP, and that's while curing myself and anyone else who happens to need it. And that's mostly just off Cover refresh.

In other things, like low man AF Fight scenarios, it's also a very useful means of regenerating MP, mostly because there's always someone in Cover range and the enemies hit hard enough for decent MP returns.

I don't really think Auto-Refresh is needed for PLDs and I think it might be a little TOO much in terms of MP restoration options. (Especially when doing party content with a BRD.)