Yeh, I dunno. That case can be made and also its opposite.
I go with the opposite. Trump and Biden are perceived very differently.
Trump is perceived as having boundless energy, being up on his feet, and because he running full speed and his cup runneth over it often runneth over into things that he needs to walk back.
But his base is absolutely not worried- at all- about his ability to step up to the issues and take action even if it is positions that people do not agree with.
Biden is the opposite. His cup is not running over and he is not suffering from the excesses of a full-savage political presence. His gaffes come from being lost in space and forgetting what the hell he was outraged about when he started in on his rant. His base is very, very, very worried about him. Even if they voted for him they are doing Hail Mary's and sacrificing chickens every time they see him start to speak.
And Trump had an enormous field and his own party against him in his primary, and he systematically took all of them down through hand-to-hand combat. In contrast, Joe had a field of duds who sort of fell apart and the DNC latched on to Joe and revved up the party machinery to prop him up as the designated dud.
Don't let any of the dems fool ya. They are scared as hell about how Joe will hold up. They are figuring plans for how to manage Joe. They have bet on a very, very wobbly horse.
I will give ya the part though about Trump being his own worst enemy but the etiology of it is vastly different from Biden's.