"Too powerful" is something that makes other mods obsolete. I can't say that about Psi. I would still rather use TC lightning focus for killing things, wear Blood Magic armor etc. Psi has a niche of fine-tuned portable automation, which has no alternatives.
Psi options can be accessible way earlier than some other mod's, and change early game more, but I love it, because I hate going through vanilla stage hundred's time over.
Psi is hard-capped by Psi regeneration, unlike other mods where you can just put another resource generation system if you need more.
After all, Psi is Vaskii's mod, and he knows how to balance things. Even if now something in it is out of balance because the mod is new.