I think there are lots of good reasons to dislike Hillary Clinton, but Kamala Harris? Why is she unlikeable?
TBH, she strikes me as mediocre. She was being at her best running for the nomination. She knows she was picked as VP for being the "right color and sex".
What has she done with the opportunity?
Strictly speaking from a strategic, Machiavellian POV, the best DNC move is for Biden to resign for health after 20JAN23 and let Harris run as an incumbent.
Unless she'd fuck it up because she's mediocre...or worse...then it's a bad idea. A free-for-all in '24 is better than a fuck up** who'd lose the election.
**The former one-term President is an example.