Quote Originally Posted by Felis View Post
You can as example use Stoneskin in the level 15 dungeon if you put the skill in cross-skill slot #1.

Exactly , if you were to be able to use your own cross class skills, a white mage could slot Stoneskin in one of his first cross class slots and never lose access to it. Makes no sense, for every other class to be able to slot it and have access to it at early level while a synced white mage doesnt.

This goes for all abilities like that, swiftcast etc