Then why do you think Nimoy's character was labeled Spock Prime in the new movies? It wasn't because fans told them to do it.
In the post of his that you quoted from,
Hober Mallow was making the point that all spin-offs are derivative of TOS, from TNG to STID. He said
"prime" Trek not
prime universe.
It's an unwontedly nit-picky point the reasons for which I still don't understand.
It is not controversial that Berman-era Trek was meant to be part of the same universe as TOS Trek, their being spin-offs has nothing to do with that and they're pretty clearly not "reboot" or "alternate universe" material in the way that NuTrek is. That's exactly why the "Prime" notation for "Spock Prime" makes sense on an automatic, intuitive level. You can
force them into some kind of similar frame on a technicality, but what for? Seems to me that it's a counterintuitive and futile exercise.
You'd have to ask him why he thought it was a distinction worth making. I'm not sure. I completely agree with the parts in your post that I've boldfaced, and have only minor qualifications about the rest (by which I mean, this whole issue isn't really of major importance overall, even just in relation to
Star Trek).
I think it's clear that Berman-era
Trek has a completely different style from TOS. There are all sorts of reasons why that is to be expected. The time difference in when they were made is perhaps the most significant. But there is also a change in venue:
cable television in the 1990s as opposed to
network television in the 1960s.
The shift to theatrical film in the 2010s (or thereabouts) is, in those terms, another change in venue. On that basis alone, change is to be expected. TOS-proper underwent changes, simply as a result of making the transition to film back in 1979.
Given all this change that is simply a natural result of the march of time and changes in venue, I
don't believe it makes sense to say that all
Trek taking place in the Prime Universe intrinsically belongs together in every way and nuTrek is intrinsically apart from all that. The takeaway I was getting from what
Hober Mallow said was that the unifying factor for Prime Universe
Trek is something essentially only nominal in nature, and the clear implication there is that the difference between that and nuTrek isn't a large enough distinction to separate nuTrek from the rest as something that is in every way dissimilar from all the spin-offs we've had before. With that, I agree.