In the novelization, what we saw of the five-year mission was supposedly a dramatization. According to Roddenberry. So, yeah, I could see TMP as a reboot of sorts. He definitely seemed to spend the latter part of his life trying to distance Trek from TOS
Yeah, I think that video makes an excellent case that TMP is at the very least a stealth reboot.
No explanation for the new Klingons, or even a reference to it. That's just how they look now. None of the characters comment on their new uniforms, that's just what they wear now. The
Enterprise is referred to as new, because that's a bit of a plot point (which as I understand, only emerged in the first place because they were afraid that the new sets wouldn't be completed when the
Phase II pilot started shooting

).
BTW, that YouTuber has lots of cool, thoughtful videos about
Trek (and
Star Wars) that are worth watching. I've subscribed to his channel.
It looks like he wasn't happy with TOS.
I don't really know? It made him a lot of money over the years. But, lots of people were given credit for its success by fans.
Well, deservedly so, I think. Remember that Roddenberry only produced the first 13 episodes of TOS and then turned things over to others. For me personally, I think that Gene Coon made greater contributions to TOS than Roddenberry did, and TMP desperately needed an infusion of the humor and humanity that Coon delivered in spades. I really wish that he'd still been alive to rewrite the TMP script.
And I can totally understand GR having ambivalent feelings towards
Trek in general and TOS in specific. In the late 70s,
Trek was still the one success that GR had attached to his name, and it only became a success after the fact in syndication. He'd basically walked away from production in the 3rd season to just cash his checks, and he probably saw others doing things with
Trek that he'd prefer they didn't. He then found himself pigeonholed as just "a science-fiction writer." Whereas before he'd written cop shows, westerns, and other things, now he was just "a science-fiction writer" in the eyes of Hollywood.
Meanwhile, GR couldn't get any of his other projects going.
Pretty Maids All in a Row was not a success, AFAIK. His
Tarzan project never went anywhere. The
Planet Earth and
Genesis II pilots didn't get picked up. GR walked away from
The Questor Tapes when he didn't want to make the changes that the network wanted (So now he's a science-fiction writer AND he's hard to work with! The bubble grows smaller...). So after a decade of this, GR desperately wants to prove that he's not a one-trick pony, and that he knows what he's doing. That tendency is even more pronounced in TNG after years of getting sidelined on the movies.
TMP allowed them to really flesh out and detail the Trek universe in a largly credible way. But in doing saw I think they lost sight of a sense of continuity with what had come before: TOS.
I agree. For me, most of my problems with TMP spring from the fact that they were trying to emulate
2001 rather than TOS.
I'd argue most of the visual changes came out just because they could. Change just for the sake of change.
Agreed. Too much of the movie is "Hey, let's show off our new toys!"