If they had given Chakotay a real world tribe you would have people saying that they weren't portrayed 100% accurately too.
This is one of those damned if you do, damned if you don't situations.
I agree that a real tribe would have presented its own difficulties, but at least they would be difficulties about something real - real problems involving real people and real history. And if TPTB did decent research, and God knows there's lots of research readily available on the civilizations of Mesoamerica in addition to actual English-speaking representatives of at least some of those cultures available there on the spot in SoCal - it need not even have been that big of an issue.
Instead what we got was the NeverneverLand Tribe. It's just silly.
Look at it this way,
Destro: Surely the intentions of TPTB were to give a little diversity to the crew of Voyager. Well, what's a better way to represent diversity? Representing a real culture or representing a fake one?
But as I mentioned earlier, a fake one need not have been that bad, if some trouble had been taken with it. It wouldn't have been as valuable as a real culture, IMO, but it could have been a lot better than what we got.
I really don't get the charges of discrimination here. Were Chakotay and the so called "Rubber Tree People" portrayed as noble and honorable beings? Yes they were. Isn't that what is important?
Well, sort of but not really. A positive stereotype is better than a negative stereotype, but what's best is no stereotype at all. And I would add that although the Rubber Tree People were presented as noble and honorable, they were also presented as being unable to develop their own culture without help from an outsider. It's a very patronizing idea - and one, I might add, that's been popular far too many times here in the real world.
I expect modern-day Egyptians (those who don't find it screamingly funny, that is) aren't all that wild about the "theory" that aliens built the pyramids, and I know for a fact that modern Pueblo Indians truly loathe the once-common theory that the builders of the magnificent cliff dwellings of the Southwestern U.S. just "mysteriously disappeared." They didn't disappear - they quit building cliff dwellings and moved away from that area, but they eventually became the Pueblo Indians, who are still around today and whose direct descent from the builders of the cliff dwellings is (as far as I know) undisputed. But apparently early archeologists just didn't find the modern-day pueblos as impressive as the cliff dwellings and so they came up with this "mysterious disappearance" thing. That's also pretty darn patronizing, if you ask me.