I'm just startled by how obvious it is when Biden wanders off from the teleprompter. He's marginally acceptable when he's staying on a tightly-controlled script--and I'd fucking hope he'd be after 50 damned years of it-- but the instant he wanders off of the teleprompter he becomes completely incoherent. It's always perfectly clear when it's about to happen too, because he sputters one of his canned phrases like "look" or "come on, man!" and then off we go into the field of Corn Pops and missing planes and you know the thing.
It's just an abrupt, 90-degree drop straight off a cliff every fucking time. If you dig back through his old speeches you still saw those phrases pop up periodically because that was how he used to buy himself time to think. It was just a "filler" he used to avoid doing things like Obama's constant "Uuh." As time as gone on, though, Biden's been using those fillers more and more because his brain just cannot find the next room that it wants to go into, so instead of being something that was fairly rare and weaved itself organically into his speech, they crop up so constantly that they become jarring.