I feel like it would probably be better for them to start small with the idea of skill trees. Instead of letting them branch out our jobs into other rolls, start off with having skill trees augment our existing skills, just an example for MCH, we could get something to make it so hypercharge applies the physical and magical damage bonus regardless of the turret out, or choose to buff the damage bonus of the turret. Then after that is put in and they have time to work on it a bit, they can try going into skill trees that branch into different roles.