Erechel
Explorer
I don't really allow multi-classing in my games (I'm a DM). But, yeah, the wu-jen is pretty much how I would handle the psionic-magic interaction, and the "innate spellcasting: psionics" of the MM. I would also manage them separately, much as the Pact Magic interacts with normal spellcasting. As for the level 11+, I agree with you: flat, flat, flatty flat.
The main problem lies on the first levels; I can't say enough how pissed am I about Adaptative Body, how cheaty and awful it is. I'm pretty convinced that when it comes to relevance its utterly broken. Of course, if you never have to worry about it if you aren't using the survival or exploration pillars (although it has an awfully useful utility in combat), but it's like say "well, I wouldn't mind about infinite magic missiles at 5th level. Why worry about combat imbalance? if you aren't fighting too much it doesn't matter how much damage the wizard does"
The main problem lies on the first levels; I can't say enough how pissed am I about Adaptative Body, how cheaty and awful it is. I'm pretty convinced that when it comes to relevance its utterly broken. Of course, if you never have to worry about it if you aren't using the survival or exploration pillars (although it has an awfully useful utility in combat), but it's like say "well, I wouldn't mind about infinite magic missiles at 5th level. Why worry about combat imbalance? if you aren't fighting too much it doesn't matter how much damage the wizard does"