I really don't see why there is such furor over the connection between Far Realms and Psionics. Aberrations in 5e are tied to the Far Realms. Many, if not most, of the psionic creatures in D&D are aberrations. There's already a pretty clear tie between the Far Realms and psionics in the game. And, while the term Far Realms is new, the connection between aberrations and psionics has always been in the game - Aboleth, Mind Flayers, Thought Eaters, Intellect Devourers, so on and so forth.
Why is this suddenly a big deal that they make that connection explicit? 5e's already gone a long way down that road by directly tying aberrations to the Far Realms, so, to me, it just seems like this is acknowledging what's already been rather clearly implied.
Besides, to me, since 5e magic all comes from The Weave, it just seems like a lot more flavorful than saying, "Hey, your character is extra special". It's just a bit too comic book for me. My mutant superhero Soul Knife adventures in quasi medieval land. I'd rather psionics gained a lot more of a "knowledge that man should not have" flavor than, "Hey, your mutant genes lets you do superhuman stuff".
I guess, to me, giving psionics a Lovecraft spin just oozes a lot more flavor than fantasy X-men.