To be honest, I don't miss anything from 20+ episode seasons. Sure, they gave more focus to more characters, but they didn't necessarily develop those characters more or advance their arcs more. Too me, even after seven seasons, many TNG or VOY characters remain ciphers moreso than quite a few DSC characters after the equivalent of one season.
And for every sterling episode there were two or three that ranged from pretty good to poor, even in my absolute favorite seasons, like TNG season 3. It's all quite subjective and personal, I know, but there are perhaps six episodes that season that I love, seven or eight that are OK, and about ten or twelve I don't need to see again.
I just really like the more focused nature of a short season, and I think it produces far more nuanced and intentional character journeys while still providing a range of different stories.