Now your classes all make sense.
Really? Because I still think the shaman class is a bit... esoteric, the noble relies on knowledge of '90s pop culture and 18th-19th century French history in the same image, and, of course, some knowledge of tarot's use in fortune telling would help with the mystic's hand. And what of the warrior and rogue? They've barely been explained at all.
Although I already figured the physician projecting would be pretty easy.
Correct me if I am wrong, but I believe you mentioned potentially needing to explain these to others. I wasn't sure about your train of thought with these, so maybe finding some way to explain some of these in game? Perhaps when letting someone pick a class, add a little bit of the description that helps the player understand the metaphor?
No, I think I'd prefer to let the interested players toss it around in their heads. Although the class descriptions might provide a few hints, and the insanity traits six of these classes possess might give a bit of insight. (Warriors are paranoid, shamans are narcissistic, physicians have hero complexes, priests are obsessive compulsive, savants are simply obsessive and bards are manic depressive.)