well, what about the Dutch? they don't come from 'Dutchland'. and you don't call people from Holland Hollanders or people from the Netherlands Netherlanders. They're Dutch.
How are Klingons from Qon'os any different?
Captcalhoun has a criticism I've always shared. See, here I think we are witnessing a key transformation of how we view our cultural entertainment.
Clearly peoples of
this planet have diverse cultures; which may be stereotyped through ignorance or cognitive energy-saving survival, but when viewing themselves (ourselves), we find deeper gradations of concepts and language.
In the 60's it was enough to conceive of a sci-fi show through the lens of a single majority culture; it was an introductory concept, after all. Since then, times have changed significantly (perhaps owing partially to Trek), and we audiences just aren't satisfied with that level of simplicity anymore - the same way we no longer need introductory story captions or pictures of moving clocks to indicate the passage of time in movies.
Indeed, if the universe of Trek is to be reimagined, perhaps now is the time to allow for depth and variety within other cultures, especially the familiar ones. Of course, if the stories are to be a metaphor for our own humanity, then sometimes only a shallow understanding of alien cultures will suffice.
And also in the future it's implied that Starfleet has been homogenized by, frankly, the best of US American values (and not the underbelly, we save that for the bad guys). Not to be political here; but the concept is one of individual rights and social diversity based upon ideologies and not value-laden organic culture. (Or so we think).
It also assumes that globalization and cultural homogenization is requisite in any advanced society, which is debatable, but at least serves as a goal for our troubled intraplanetary relations. It asks us to hope for peace and unity.
In an hour TV show, we just have to make due with humanoids speaking English, otherwise a lot of viewers just wouldn't bother. But books are where these things can really be hashed out. As readers and publishers wish them to be more character-oriented, and not so much with the special effects.