Sure, I’d welcome Biden changing my mind on this.

I think it’s a little alarming that his last international travel was almost two weeks pre-debate and that left him tired enough to perform badly. I also don’t think it bodes well that he hasn’t yet done any big interviews or press conferences to show that it really was just a fluke, which seems like a fairly easy thing to do if he really is actually fine. I would feel much better about his odds of beating Trump if he could start reliably doing public speaking at a similar quality to what he displayed in 2020, which remains to be seen a whole week later.