This is an argument for why Biden is able to lead. Speaking for myself, I'm not so worried that Biden is unable to lead. He's old and obviously slowing down, but he's got decades of experience and, as you say, a whole administration's worth of expertise.
I'm worried that he is unable to win.
I mostly rely on built-in "scheduled send" features these days, but in the past (and possibly future, can't remember!) I've used Time Cave and been happy with it.