Just my hypothesis, but I don't see Mr. Biden taking USA to some strange direction or probably any direction. He is the status quo, the one least offensive to many votes.
Whether we want that status quo is another matter, But I think many voters would prefer that status quo than giving Mr. Trump the free rein he seems to want.
Unfortunately all those other things Ms. Martinchek (and others) seem to want are not going to be issues in this election. There's not much even the best politicians can do about that when the main election had defined the main issue for us.
As for better people, the USA has 350 m people, Surely it can find people better than Biden or Clinton. But the electoral process is not conducive to lots of competition to find those people.
It's time to change the system.