All fair points. DS9, TNG, and VOY all also changed showrunners and overturned the writing staff during their runs as well. My point was just that it was happening. Not that it meant anything.
There is ONE wild shift in style IMHO with regard to DSC, and that's how they dealt with the Klingons at the beginning. It definitely felt like the intent was to show the war from both sides and that the Klingon characters were going to be main characters as much as the DSC crew was - at least, that's how it felt in the first few episodes. Which was different from what we've seen before - we usually see things mainly through the eyes of our Starfleet crew, with minor changes here and there. The whole setup of DSC, where we saw a lot of the political infighting within the Klingon houses, the torchbearer, all that stuff - we wouldn't have seen that on another show.
And we didn't see it again after those first few episodes either.
With that said, that's the only real shift in style I can think of. Michael's character has completely changed over the course of the show, but that's to be expected as a show grows (she went from struggling with her Vulcan upbringing and her emotions to...well, just being emotional and pretty much ignoring all of that).
The jump to the future may not be stylistically different - it still feels like the same show - but it definitely changes the narrative completely, enough that I'd call it a soft reboot, considering that it appears that they intend to stay in this new normal - adding Book and Adira, Book's ship, the new Federation, etc.
Changing the subject, I know most don't agree with me on this - but man, VOY season two was really great, with the recurring minor characters, Hogan, Seska, Jonas, Suder - then they just said eff it, let's kill them all and make it the Seven of Nine show. UGH. Such promise wasted...
When DISCO was still in the beginning stages after Fuller left, I remember reading that it was going to be kind of Game of Thrones like with the Klingons, and we would see more of them. I agree that it all felt thrown to the side shortly after the beginning. I think some of the fan backlash played into that. Hardly anyone liked the redesign, nor did they like having to read the subtitles. I didn't mind either, but I'm pretty easy going on changes, I just want a good story and to be entertained.
I'm rewatching Voyager and just finished season 3. It is ALOT better then I remembered. And yes when they had a lot of secondary character ala DS9 I felt the show was better. Those secondary characters helped show the tension I was talking about between forced to work together Maquis and Starfleet crews. I wanted more of that. I wanted to really see these two crews adapt to each other, not have all the tension and drama go away in a snap.