Exactly. The media - especially the "mainstream" outlets - have latched onto this with the ferocity of a rabid animal and (IMO) are blowing it wildly out of proportion in pursuit of clicks.
I think there might be a few things going on. (1) we might constantly live in the moment as we are inundated by media, tv, radio, internet, podcasts, constant noise much of it related to technology, but some to greed and clicks. (2) The Russianpublicans have been promoting a narrative of Biden's senility for years and his performance was very compatible with playing into that while his poll numbers are not great...even if he was coherent later. (3) The D's are a lot more honest and frankly brainy and so a bad performance makes D's become introspective, even leading towards analysis paralysis. Many winners had poor performances in the past, Obama for example, or W got trounced in one debate. The Republicans don't really care if their guy loses a debate. Debates are for intellectual types. They want to drink a beer with their guy and listen to locker room banter about grabbing pussies. But D's take this seriously in this moment.
The truth is for most of us younger than ﹰBiden, we could easily get hung up on a word or thought in a debate at 9pm with a poor sleep schedule and on cold medicine. But because of the nature of what is going on ﹰBiden will need a stellar performance from now on. I do hope that will make it blow over.