What connotation is that exactly? Does "The Virgin Islands", or "The Hague" for that matter, also have that connotation in your mind?
I am again just saying that there is nothing racist about the "the" in "The Congo". It is just a natural way to shorten "Republic of the Congo". It might be unusual nowadays, but that does not mean that there is anything pejorative about "The".
"Use case" has nothing to do with it, nothing about language use is fully "rational" or "optimal". It is obviously _possible_ to make do without the article, but what I am getting at is the misdirected anger some people seem to feel towards it.