I understand your point. But I have to disagree. For me it boils down to this:
- TNG shows future humans
- PIC shows present day Americans on spaceships
Now I have a small culture shock with both of these. But I can see why American audiences & writers can identify more with the latter.
I never believed in Roddenberry's "evolved" humans. I DO however believe that people growing up in a post-scarcity, post -healthcare-issues society will be more gentle, rational people.
Now both approaches are valid. I LOVE nuBattlestar Galactica & the alien franchise, both pinnacles of the "flawed humans in space" approach.
But for me, the Roddenberry-ian humans are as much a part of Star Trek as beaming and phasers.
That also applies to TOS btw (which feels "more" human because the characters smile & joke a lot more - but it's actually quite amazing how similar TOS is to TNG in regard of "more enlightened" humans). Even DS9 "rebels" against this approach, but it's still there. For me the shift appeared on ENT - and all modern Trek since then.