Y’know what we don’t see enough of in star trek?
Modern Federation culture.
I don’t buy the theory that their culture is stagnated.
they have dozens of worlds in TOS, and far more in TNG, and your telling me that vulcan music hasn’t made it to mainstream? or that the klingons only have hard rock? c’mon. Vulcan musical tradition probably has a lot of EDM and orchestral stuff. I bet kilngons have a long history of marching music, soulfull ballads about war, Shakespearean plays about honor, etc. and the federation is likely to have produced mixtures of all of that.