I agree with this so much! I like SNW a lot because it has a lot of that old TOS vibe I love (as opposed to Discovery, which takes itself a bit too seriously, if that makes sense?) but you're absolutely right, it seems to be a thing in ST now to use new characters only as plotpoints for old characters and their own storylines. I love these old characters, but what's the point of introducing new, great ones, if we're going to lose them so quickly? I feel that the Lower Decks cartoon is the only current ST series that lets new characters shine without using them as props for old ones!

I also want to see more of the SNW characters, but the way new Trek is built, I don't think longer seasons would make it happen. Discovery was longer, and I felt it dragged on a lot, because they didn't use the amount of episodes they had for character development that felt organic and deep enough, and many potentially great characters felt wasted to me (Airiam, Tarka, and so on). Maybe it's my nostalgia talking, but I feel that older Trek treated characters more fairly and let them have complete storylines, so even if they were written off, their stories felt more complete and almost satisfying, even if they got a sad ending (like Dax, for example).