Parmandur
Book-Friend
In an interesting turn of events, I'm going to be playing in a one-shot Dark Sun game. The DM is opening up the Mystic class. So this is the first time I've honestly looked at it.
Wow. Upon a first look, it's garbage. The Disciplines are very underwhelming. Psi Points should recover after a short rest like Ki points for a monk. There's a talent (which is the only at-will ability you get) that basically all Mystics get for free at 2nd level anyway. No way is this comparable to a wizard.
I would consider it only because it's thematic to Dark Sun, but even so I feel it's a punishment to have to play one.
The Psi-points have an exact mathematical relationship with slots: if they recovered on a short rest, it would be more like the Warlock, and even more overpowered than it is already.