I'd be in favour of this, makes it easier to do FATE farming without having to lose gauge each time, and could potentially let me enjoy the open world with friends at that point in MSQ or while they're levelling alt jobs.

That said, jobs need to be more enjoyable at lower levels. So many of them feel barren below level 70, and just plain dull at 50 or below. I don't expect a complete kit at 30, but at the very least the basic job mechanics should be available by then (think Lilies, Aetherflow, GNB Cartridges, etc.), and level 50 should give the basic rotation (PLD should get Holy Spirit at this point, RDM should get at least Verflare/Verholy, etc.).