LOL, I think the Joe we saw WAS jacked up as much as they medically and safely probably could. People his age have some days that are better or worse than others, but I think what we saw is exactly who and what he mentally and physically is. It is possible that it is Joe himself that is the problem for the democrats, he thinks he can do the job and win the election. Maybe there is no one there with the guts to tell him that it's time to quit the campaign cuz he's gonna lose and somebody else might have a better shot at beating Trump.
Caveat: I don't know squat about what's going on in the WH and who's telling Biden whatever. But it could be that he is so convinced that dropping out would be worse for the country than staying in.