It's a decent tradeoff for the freedom and being able to focus all your leves in 1 class, which is perfect for low-time players,the intended audience of the system and the revamps.

Since you can solo grind or grind with a small party it's not as large of a time sink, either, especially since they intend for you to level off of enemies the same level/around your level so it would be easier to find appropriate enemies around the aetheryte areas. If they make it rewarding enough the people that have time to play will play even when they have no leves, I know I will.