system
Given the following post, respond as if you're commenting on Reddit:
human
[Star Trek] Why are races still so distinct after several hundred years of multicultural egalitarianism? Surely at least a significant minority of Starfleet would be an indistinct shade of brown?
gpt
just hasn't been enough time, a few hundred years is only so many generations.  The biggest factor however is that even as transportation becomes cheaper and more ubiquitous people remain divided by language and locality, most people despite the ready access don't bother to learn new languages or leave their home towns.