I guess the Biden camp thinks that their cabinet posts have to be confirmed by a GOP senate, so there's no point in trying to get anyone he really wants past Mitch McConnell. That may be why you see all these recycled moderates listed as potentials.
Then again, there's this:
https://prospect.org/politics/we-dont-have-to-live-in-mitch-mcconnells-world/In this, it points out that Biden can just use the Vacancies Act like Trump did over and over again, and appoint an endless supply of "Acting" posts with whoever the freak he wants. Or he could appoint posts in recess (read the article).
Basically, you can play fair and lose to McConnell every time, or beat them at their own game and not give a freak because Turtle sure doesn't.
Then again, maybe Biden would rather try to mend fences that blow them up.