I actually don't think that we've really seen a clear example of the daily life of Wakandan citizens; we've only seen the upper echelons of their society. I don't think that the rest of their people are considered third world citizens. I do think that this assumption is due to a lack of understanding when it comes to Afrofuturism and how tribal societies entertwine with modern technologies.
Likewise, the tribes aren't just work groups, and even if they were, they'd still be micro-cultures in their own right, with their own hierarchies and representation, as indicated in the movie.