Who said anything about their effect? It's a simple matter of fact. You said no other TOS-era ships were seen until TOS-R, and that's an incomplete statement.
Background details like that aren't meant to be binding canon. They're just texture that was meant to create a passing impression and not be examined in detail, and it was convenient and time-saving to lift some references from an existing book that would sound or look like the sort of impression they wanted to give. I mean, they passed off FJ's deck plans of the TOS ship as plans of the movie refit ship, so they weren't intended to be taken literally, just to fake it for the sake of getting the shot. So it's no more canonizing those ships than, say, the use of the Mayberry backlot in "The City on the Edge of Forever" was canonizing The Andy Griffith Show as part of the Trek universe.
It's not a matter of credibility or continuity or whether it can be "explained." This is fiction, after all, not a documentary. I just wish the set designs felt more like Star Trek. The ship exteriors do, the prop designs do, even the uniforms kinda sorta do, but the set designs are just so alien to me, so unlike what I think of as a Starfleet aesthetic.
Well, it wasn't me you were initially responding to, but I've made similar statements elsewhere and needed reminding myself, so that makes little difference. I do take your point, but must pick a few nits.
Nothing was really meant to be "binding canon" during that period. And FJ was specifically asked by Lou Mindling of Paramount to be a consultant on TMP when the project was in development, and only declined any active role because he didn't want to step on Roddenberry's toes any more than GR already felt he had by his—quite properly, in fact—dealing directly with Paramount to have his works licensed and published through Ballantine under his own copyright rather than through Roddenberry's Lincoln Enterprises. Those works only came to be considered "apocryphal" later by Roddenberry—who was already being marginalized in the creative process for entirely separate reasons,
i.e. his script efforts weren't considered good enough—out of revenge. And guess what
else the Great Bird declared apocryphal? TAS!
I might also point out that the original intent wasn't even to
have freighters and cargo ships like the
Antares and
Huron be part of Starfleet proper, anyway, but more akin to merchant marine. That's why she was
S.S. Huron in the script and dialogue in the first place, even though the animators contradicted that by giving her Starfleet pennants and "U.S.S." painted on her hull. Not that I'm actually arguing she should be ignored, here, of course. I'm just saying that the Connie was originally supposed to be unique and different, and the longstanding tendency to take her as being representative of some default "Starfleet aesthetic" of the period was always somewhat reductive and bolted-on. And like Spock being taken as the quintessential Vulcan, more a result of having had
few other exemplars than anything else.
And I still don't get what you find "alien" about the DSC sets, particularly. But taste is taste, so I can't very well argue with yours. Please forgive me, if I've given any offense. It wasn't intended.
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MMoM