You're doing it again. You're mistaking "what trends are currently in" for what actual, real people think out there in the audience.
Those are LITERALLY the same things.
No, they're not. (Not unless you believe some creative-enterprise variation on the Efficient Market Hypothesis, at least... and the Efficient Market Hypothesis has been pretty widely discredited at this point. It's a tautology masquerading as a theory. Behavioral economics are where all the credibility is.)
When MirrorMirror keeps talking about what's "in trend," he's talking about what people
who are trained in design and
do it professionally for TV and movie studios think of as trendy — or, at least, what their bosses and clients think of as trendy. Unless they're mind-readers, they do
not have any special perception of what actual audience members like and don't like — designwise or otherwise. If they did, every new show and movie would be a hit... whereas in reality, most of them are failures.
I mean, unless you are using an alternate definition of "the audience," which is entirely possible. Do you mean specifically THE FANS, whom you assume based on [citation needed] think exactly like you?
You've got it mixed up here. MirrorMirror is the one who keeps insisting that audiences all think the same way, which is (conveniently) just like him. I'm the one who keeps pointing out that they actually have diverse and unpredictable tastes.
Because Star Trek is a commodity whose continued existence depends on it being profitable. If the brand doesn't grow, Star Trek doesn't make money. If Star Trek doesn't make money, they won't make NEW Star Treks. If they don't make NEW Star Treks, we're stuck with reruns for the rest of our lives.
I, for one, would enjoy seeing something new every once in a while. I fully accept that I won't like all of the new stuff, even though I expect that I will like alot more of it than I dislike (this has been the case for every iteration of Star Trek so far except for Voyager).
I don't grasp your logic here at all. You're basically saying that old Star Trek, the stuff that made us love it in the first place, just isn't enough — we need
new Star Trek, even if it sucks and we don't like it. You're mistaking quantity for quality.
VOY was a terrible show. My appreciation of Star Trek would not be diminished one iota if the entire seven seasons of VOY ceased to exist. I daresay the overall body of Trek lore itself would not be diminished, either, and in fact might be
improved as a matter of average quality.
Moreover, as I've already pointed out, it's pretty much a foreordained conclusion that new Trek product
is going to be produced, for years to come. Given that, I'd rather the new stuff be good. To the extent that it's good, I'm going to praise it; to the extent that it's not good; I'm going to criticize it. And "good" is
not the same as "profitable," a statement that should be self-evident to anyone who's ever watched TV. I very sincerely
do not care if a project makes money if I don't enjoy watching it.
TOS designs LITERALLY WERE cheap. They didn't have the budget to do anything super expensive.
First of all, as apparently it's necessary to keep repeating this on a regular basis, there is a
difference between designs on the one hand, and production values (including special effects) on the other. Sophisticated designs can be executed cheaply, and slapdash designs can be executed at great expense. (I'd argue that DSC is all too often an example of the latter.)
Second, as is also apparently necessary to repeat in contrast to popular myth, the original
Star Trek was
not produced cheaply. Its first-season budget was $190k/episode, roughly $1.4m in current dollars. It was one of the most expensive shows on the air at the time. It received Emmy nominations for its visuals, in every season.
(That's not to say it didn't face budget constraints, especially in S3. But every show faces budget constraints; that's the nature of TV. You can see it in DSC, even with its astronomically high per-episode average.)
"Trek" doesn't have history. Trek is fictional.
Sigh.

We're talking about continuity here. It's a self-contained fictional universe, with its own internal history. That's one of the big components of its lasting appeal. You may have noticed that people on these forums kinda enjoy discussing it. There are countless books and an entire
very impressive wiki dedicated to documenting it. I can't imagine what you accomplish by pretending that aspect doesn't exist, beyond undermining your own suspension of disbelief.