Much better than Roddenberry's attempt at novelization, which (ironically) reads like it's by someone that's never seen Star Trek.
I think, rather, it reads like it's by the one person who'd seen the version of
Star Trek that existed in its creator's head, as opposed to the version he had to settle for making with all its real-world compromises and sacrifices. Or rather, the version that it had evolved into in his head after a decade spent thinking of all the ways ways he wished he'd done it differently. Because that's what every creator does when looking back at their old works -- think of all the ways they could've been improved on if you'd only had more time, or had known then what you know now.
Heck, this very thread proves that, because that's just what
Donny's doing with his old renders.
Yeah, Roddenberry's involvement with the TMP always gave me a big fat ol'

. The "Love Coach" and "New Humans" thing was particularly in need of a good editor's red ink pen.
Neither idea was all that unusual in 1970s prose science fiction. Post-Sexual Revolution, there was a lot of SF about futures that were more liberated and casual about sexuality than we are, so the idea of a society that's comfortable enough with sexuality to treat it as a teachable skill like anything else fit right into the era. And the New Human concept fit right into the New Age philosophies of the era, the fashionable interest in expanding consciousness or unlocking higher levels of existence. Indeed, that sort of thing had been a theme in science fiction well before then, at least as far back as Clarke's
Childhood's End in the '50s.
For that matter, both ideas were integral to TMP -- the whole story about V'Ger's quest was about seeking higher levels of consciousness or existence, and Ilia represented a sexually enlightened culture, though that could barely be touched on in a G-rated movie. So there's nothing incongruous about either idea in the context of TMP's story.