I find the lack of Extra Attack for at least one of the combat-oriented orders (Soul Knife and Immortal...the latter being more just tankish than actual martial combatant) seems...off. Sure, if you pick the Celerity discipline, there you go....but making it a "discipline tax" feels off. Sure, other useful stuff attached to Celerity, but geez, even a valor Bard gets extra attack at 6th and they can be just as versatile with their spells.
Plus Surge of Action also feels "off" under Celerity...all the other aspects of that discipline deal with movement, something about getting from here to there. The extra attack doesn't feel like it fits to me, though the Dash option definitely does.
Other impressions:
-I like the Wu Jen here, though I'll be renaming it to something else. Wu Jen to me is a strictly arcane spell wielding class (play a LOT of Oriental Adventures 1e-3e, so calling this a Wu Jen would be too odd at our table). Started using Heroes of the Orient from DM's Guild as well, and the Wu Jen in that product is more how we view the Wu Jen. So...nifty and like the psionic wu jen, but renaming it
-Reading more, I'm not digging any of the disciplines that offer extra attacks (just the extra attack if it does more than one thing). Not that I find it a balance issue or anything, it just doesn't feel quite right. I prefer extra attacks being intrinsically linked to a class-granted ability (or subclass). Extra actions or bonus actions perhaps. I dunno...disciplines giving extra attacks just feels wrong.
-Soul Knife....nope. I'll be completely changing that in house rules, name et al.