Given how long it took them to support PVP bars and the like, I'd rather not juggle Deep Dungeon-only skills. But it would be good to have more solo viability for this gradually make its way into the game. It would be perfectly appropriate for, say, Black Mage to get some kind of Drain skill later on, and for tactics revolving around crowd control or interrupts to make other jobs viable in different ways without just giving every job Physick/Esuna and calling it a day.