Crystals are redundant, when an equipped weapon dictates job. They should not even exist and should be removed, just like belts.

There is Zero reason to have a base job only change it's name to become something different at 30. The exception being Scholar and Summoner which could do with a revision on introductory class identity anyway.

You're not an Arcanist, you're just a gimped Scholar/Summoner, just like every other low level class. An 80 running Sastasha is still going to have about the same amount of access to skills.

Think bigger picture, and just get rid of soul crystals, which are not even stat providers anyway.