The question, however, was what a Psion could do (or expected to do) that a Wizard cannot. Some of which comes from the Bard and Cleric spell lists. Some are things that come from the Psion power list from 3e/Dreamscarred Press.
Fair enough, but the wizard isn't the best example for comparison if it's just a spell list comparison. The real difference isn't the mechanics so much as the list of powers vs spells.
My point was that most of those powers already exist in the form of spells or are just flavored variations of existing spells.
I would also say the general concept of a seer vs a diviner or a kineticist vs an evoker or a telepath vs enchanter isn't all that significant. That's more of a flavor thing than a mechanical thing. Flavor is easy to change and minor mechanical differences aren't that hard to compensate. That's why I think we might still see the mystic class. Developing and testing a new system take more resources than adapting a system.