I see you point, although my understanding is that we're talking about diversity, not inclusion.
If someone would create a pack about, for example, Irish descent American unit, I'd also gladly check it out. It does not make those people less American or something.
Heck, we do have scenario packs about SS Volksdeutsches from Croatia (nomina sunt odiosa hmmhmm Prinz Eugen hmmhmm), about Reichsdeutsches in Wehrmacht, Alsace Germans etc. Why not for the rest of the world?
It is just a matter of fact that there were purely black units in the US and their history is no less interesting than that of purely white/mixed units.
Before the war, in Poland there were units made up (almost) exclusively from Ukrainians/Belarusians, many of citizens were Jews etc. It would be very interesting for me to see some scenarios about battlefield of such units.
Given that I'm of mixed Polish/Ukrainian/Belarusian descent, I would not feel being separated from being a Pole.
But then again, when it comes to one's heritage, it starts to get very subjective.