LoglineCommander Una Chin-Riley faces court-martial along with possible imprisonment and dishonorable dismissal from Starfleet, and her defense is in the hands of a lawyer who’s also a childhood friend with whom she had a terrible falling out.
Splitting into separate cities is way more reminiscent of ghettos, which is extremely dark. I don't think the show quite grapples with how monstrous this actually is, ignoring my concerns about the gene modification stuff as a metaphor, if we take it on face value as a signifier of marginalization this is not some cultural bias the Federation needs to work through, what's described is borderline genocidal.