Either Biden is in full control of his mental capacity or he is not. Keeping him away from press conferences and public outings sort of indicates he is not.
Now the media in America can do a good job of covering for him, but what they can not do is keep the press in other nations from reporting on it (or the various spy organizations from finding out).
It is obvious that Harris is taking over some of the functions of President (which I guess is good in an odd sort of way).
However, the main point to keep in mind is that the Democrat party (and the media) installed a mentally unstable man into the office of the President. I hope they are held accountable for this someday.