A sorcerer is someone who gets their powers from unusual sources. A psionicist is someone who gets their power from an unusual source. And I'd call out a specific difference between psionics fans and D&D Psionics fans. I've liked Psionics, but long spell lists have always struck me as anti-psionics (possibly because I played GURPS before D&D). And 1e psionics were IMO a mistake.Im guessing your aren't a big fan of psionics because a sorcerer is not the same as a psionicist.
The sorcerer is not a spellpoint class; you can't treat the whole thing as a spell point pool because conversion from spell slots to arcana points is lossy if you're not an arcanist. Also Dissonant Whispers, Calm Emotions, Sending, and Rary's Telepathic Bond are all on the bard list but not the sorcerer list, but are very much psionic spells. They are on the aberrant mind list of course.You don't even have to pick that subclass to replicate that list of "psionlike things" except the ignore component part . Every sorcerer can have spelllpoints and use the spells-that-once-were-psionic-powers.
It's rare to find someone complaining about the lack of historical D&D psionics who thinks 5e has psionics in it. To me, other than the terribly made Soulknife e.g. 3.5 didn't have psionics; it had wizards with the serial numbers filed off. But when I've asked why the Aberrant Mind isn't a psion I've only been told "It's not its own class" and "It has tentacles sometimes".Not going to argue that old chestnut, but it's rare to find a fan of psionics who thinks 5e has psionics in it.