Sure, but where is the polling/proof showing that Kamala Harris or Stacey Abrams or Val Demings are more popular amongst the black electorate than Joe Biden? He beat Harris amongst black voters in the primary, Demings is pretty much unknown, and I think reporting has shown that Abrams is unpopular amongst the black political establishment.
The turnout point is correct, but which black female politician has shown they can juice turnout beyond what Biden can do on his own? You yourself just said the black vote strategically picked Biden because they think he's the best chance to beat Trump, so I'm not exactly seeing where the reservations about Biden would be coming from now that he's won the nomination. I could see the anxiety coming from the fact that the Clintons ran deep with the Black community but Hillary wasn't able to get the turnout she needed, but Biden is already shoring up Hillary's soft spots - namely WWC men and suburban women - that I don't see the Black community as his most unstable constituency. He literally just won the nomination on the back of the black vote.
All unknowns.
I know black women that will stand in the rain for 48 hours just to vote for a black woman vp.
Kamala will decrease the turnout of black male voters imo.
I think an unknown is great. U can shape her image to be what’s needed