While I wouldn't argue that it's better to avoid the issue of B'Elanna's human ethnicity than to handle it badly and resort to clichés, if the series/franchise wants credit for showing characters of various ethnicities, shouldn't they try to do it well?
Yes, of course the terms "Latinx" and "Latin" are far too broad to really be useful descriptors, but it's not as if the series gave us any way to narrow down B'Elanna's human heritage. Even the name "Torres" is used both in Spanish and Portuguese. The only descriptor I can find for the actress's ethnicity is "Hispanic," which rules out Portuguese and suggests South or Central American heritage rather than direct descent from Europe.
I keep coming back to @Christopher's comment, above, about how Discovery gives the non-binary character Adira authenticity by drawing on the real-life experiences of Adira's portrayer, Blu del Barrio, also a non-binary person. Could Voyager have given Torres's human side a credit's worth of authenticity by drawing on the real-life experiences and cultural knowledge of her portrayer, Roxann Dawson?
Or, barring that, could they at least have tried not going out of their way to make everything about her human side as unrelentingly whitebread as they did? I mean, her dad's name was John, her uncle's name was Carl, and she had three cousins named Elizabeth, Michael, and Dean. Her favorite foods were things like banana pancakes and fried chicken. She read romance novels and was good at math and athletics. Whitebread.
Star Trek in those days really didn’t do much ‘here’s what earth culture is like now, after a few hundred years and two big wars that ended in a post atomic horror’. In some ways that really works for it. In other ways it really doesn’t. I think it didn’t know how to do anything other than LA culture, and in that way, humanity becomes exactly the same as the cultural monoliths that every other race in Trek was. In that regard, almost by accident, it does present a ‘post racial’ society. Which again is a bit of a double edged sword, especially when the humans seem to basically cosplay their national stereotypes (and we see an ‘alien’ do this too... the ‘Scottish’ fellow in sub Rosa.)
I don’t think this is by design, but it very interesting. All of my favourite foods, most of my favourite films and tv, and even some of my fashion choices are not from ‘my’ culture. The bits of my own culture I do consciously favour are often done tongue in cheek and with a wink and a nod. So... perhaps this a valid extrapolation for humanities future?
Mostly it’s because Trek is made in la la land. There isn’t an accurate cultural portrayal anywhere. Apart from la la landers.