Well, let's be honest. Leveling already became kind of easy. If mindless F.A.T.E. grinding bores you, as well as spamming dungeons, why don't you try a mix then? With Vanu and Gnath on max rank, you have a solid source of exp, as well as several others. At the moment it takes me about 10 days to get a class from 50-60, but It's not bad because I do several different things:

- Doing 6 daily-quests from Vanu and Gnath
- Daily Low-Lv Roulette
- Daily LV 50 roulette
- Daily Trial Roulette
- If a small amount of exp is missing that day, I do a few leves
Given the FC-Exp-Bonus, Food-Exp, Armoire-Bonus and rested Bonus, this makes roughly one level a day in aproximately 1.5 hours (2 hours if the roulette-groups are bad)

So from a pure leveling-experience perspective, I'd say it's fine even if it's not the fastest way to level.
On a learning-perspective...well you do several dungeons and trials. If you were able to play the class decently on lv.50, you should be able to do so on 60 as well. The leveling-phase is too short and doesn't offer content difficult enough to really learn how to optimize the class, especially since you need all skills to even be able to do so.

While I would personally appreciate an acceleration of the leveling process due to time issues in RL, I don't think it's necessary.