Way too much. North Carolina is a far more relevant state, and frankly has been for decades. So has Georgia. South Carolina is too old and too religious.
That's not always true--depends a lot on the dynamics of the primary. Even in 2020, where Biden consolidated support in part due to his strong performance with Black voters, Sanders and to a lesser extent Steyer won some Black voters over. There are plenty of other 'depolarized' primaries out there--NYC 2013 IIRC is another good example.
It's also worth noting that White voters in NC are a much more relevant voting bloc than in SC.
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