Jeremy spoke on this on Dragon+ yesterday, some of this might help. Jump to 50 minutes for discussion of why the mystic was shut down, and what that might mean for another version of psionic full class: https://t.co/1uNhhFQM4e
— Dan Dillon is the Least Turnip 👥 (@Dan_Dillon_1) April 16, 2020
There have been many questions recently about whether or not there will ever be a full psionic class in #dnd. Jeremy Crawford spoke at some length about it on Dragon+ yesterday, and here’s the high view answer to that question: He goes on to remind that until 2nd edition's Complete Psionics Handbook, there was no psionic class. It was a power that any character could manifest.
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— Dan Dillon is the Least Turnip 👥 (@Dan_Dillon_1) April 16, 2020