Maxperson
Morkus from Orkus
The psion and witch are a different issue from the non-magic warlord and non-magic fighter.I'm guessing it's similar to why some folks want a dedicated non-spell psionic class, non-magic Warlord, something new Witch, etc...
With the warlord and fighter, the issue is that they want abilities that cannot exist except with a supernatural origin, but don't want them to be supernatural. That would create a disconnect where the fluff and crunch do not match.
With the non-spell psion people aren't asking for a disconnect. They are asking for a different kind of supernatural power that isn't spells. It's akin to a bunch of people wanting a non-magical fighter class that just does other within reason non-magical things than is currently written.