I personally like the idea of having a single "Internal energy" power source, and that the Monk, the Psion, AND the Sorcerer should all fall into it.
Now I'm not crazy about the word 'psionic' myself and can acknowledge that while Ki/Chi/Qi is defined as "circulating life energy" in Chinese philosophy (after my quick google definition search), I don't know if that re-appropriation for all "internal energy" D&D classes makes sense or is really appropriate.
If we wanted to choose a synonym word for internal energy to use for the power source to go along with Arcane, Divine, and Primal... I'd say we'd either go with Mystical, Preternatural, Psychal, or Cerebral.
Of course... doing this would piss off a lot of people-- the Psionic stans who don't want to believe psionics is "magic", the Sorcerer stans who don't want to think the internal magical power of a sorcerer is the same internal power the Monk or Psions have, and Monk fans who want to maintain that Eastern tradition that isn't psionics nor the arcane magic of the sorcerer. But it's exactly why all of these classes are kind of wishy-washy to me in my opinion-- we apparently need to have three completely different types of "internal energy" of a supernatural type... meanwhile Wizards, Cleric, Druids, Bards, Warlocks, Paladins, and Rangers all just use "Magic" in its various forms. Pick a lane people!
