Psionics have already been in a PC AD&D game: DARK SUN. The AD&D game after the EOTB series, and before Baldurs Gate.
Psionicists were cool, but no better or worse than some of the other classes. Any character could use psionics to a degree if they had an aptitude for it.
There's no reason why it isn't in games now, other than designer choice. The role is covered by Mages and Sorcerers - that being, characters who use mental 'energy' rather than physical.
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