It depends where you are in the country. In the Deep South, voting is so racially polarized that you do probably need a black majority to elect a "candidate of choice"
I live in a 60% black district in the Deep South that regularly re-elects our white Jewish candidate in overwhelming landslides. Our black five-term (18 years!) mayor ran a primary campaign, pointing out that the seat was "reserved" for black people and thus, belonged to him. And he got his a$$ handed to him at the polls by black people. Cohen won
79-21 in the primary, in a district where most whites are Republicans. It's time to let go of the racial gerrymanders.