To add to this, if anything, all they appear to encourage is further segregation. Compare Trek back in the late 60s where Kirk and Uhura kissed and present day where all black protagonists "stick with their own kind". The girl in this has a black lover, the lead in Discovery has a black lover, etc. I can't recall a time when you see a caucasian actor being a love interest for a black lead beyond maybe for eye-roll comedic effect.
That said, is that a case of the focus groups insisting on this or the studios thinking the world would lose their mind if there were more black/white pairings? If anything, the companies that make these shows are way less likely to try something risky compared to the past.