Your first point is not incorrect. However Joe is being advised to debate Trump because it'd likely show off his dementia setting in.
Mike: Since when was having dementia a dis-qualifier for the status of POTUS?
I recall a fellow Trump Republican (who defeated the then incumbent president, Jimmy Carter) allegedly having dementia during his reign. Of course nothing became official until well after he left the White-house - but the stories of Nancy being the de-facto ruler of America during the latter years can't be ignored ().
Trump was actually older than said ex POTUS when he won his first presidential election. And Trump was given a clean bill of cognitive health a couple of years ago by a physician who had tested him for cognitive impairment. So armed with this advice, I assume that American voters clearly have no concerns regarding Trump's mental fitness - maybe ?
BUT- ultimately it doesn't matter what Whitehous doctors say; it's POTUS's performance that is most telling. I happen to be of an age where I remember Regan's curious memory lapses and his repeated bouts of confusion in public (particularly his absolutely appalling testimony during the Iran-Contra inquiry) - which were the genesis for speculation that he was undergoing a gradual mental decline. I also recall the rebuttals from Reagan’s doctors who said much the same thing as Trump's physicians.
Given Trump's apparent inability for retaining detail, his now legendary and bizarre one-liners (like ingestion/injecting disinfectants for COVID) and his constant confusion that anyone who disagrees with his views has a personal vendetta against him, I reckon that the jury is out on his mental state- maybe?
Now, it also maybe that Biden is similarly afflicted and he may well not be the brightest penny in the purse. The November elections might be a contest where voters are faced with the daunting prospect of choosing the least mentally impaired candidate- maybe?
Don