Man I love him but he is way off his peak. Contrast with his destruction of Paul Ryan in 2012. But you’re right that it’s not cognitive deterioration. His cognition is fine but it’s harder for him to express himself and it looks bad.
Yeah, that's my strongest argument for him to step aside. It's not that he can't make important decisions in a briefing, but that he doesn't project the confidence that he can. And Americans want to feel assured.