Beltran is an actor, and would have wanted his character to be well developed. the fact is it was not
we never knew what tribe he came from. we never even knew who his mom was, or if she was still alive. And his native American heritage was one of the defining aspects of the character.
Chakotay's poor characterisation was one reason IMO why Voyager only was a good
show, and not a great
show like TNG and DS9.