What if we got the Sub-Job System in FFXIV?

[Ameela]

With just what's in the post, why would any healer pick White Mage?

It doesn't seem to be suggesting taking anything away from current class kits, so a healer picking WHM would mean having two res buttons. Lightspeed feels like the better example.

Then that'd mean White Mage is completely useless as a sub job for every job aside from maybe Black Mage and then it's a choice between whatever other job offers the biggest benefit. You already see this with the current cross-role system - Eye for an Eye isn't a bad ability by any means, but there are simply much better options so there's no reason to ever take it.