Bob Dylan and Joan Baez singing together was pretty awful, wasn't it?   But I'd say that was more down to Joan. Beautiful voice, but a beautiful voice wasn't what was needed on those occasions, and with those songs.
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It strikes me there is a touch of Doctor Who about much of this.

You'd just get used to one Doctor, and learned to appreciate his idiosyncracies - and then, whoosh, and he'd regenerate and come back as a completely different person. And there'd always be loud complaints about how the new one wasn't a patch on the earlier one; and new viewers who'd come in at that point, and for the thisn one would always be the reral Doctor, and the earlier (and in time the later ones) were inferior.

Dylan's been much the same. We've all got our favourites or our pet-hates. But there's never been a Dylan yet who didn't come up with something I value that nobody else could coem up with.

Someone in the movie says how they talked of him as a shape-changer. And there was one point where Dylan was joshing about how the band would have to get a new Dylan next week, becausen the current one was gettimg worn out.

Dylan as a Time Lord... And if ever they decide there should be an American Doctor Who, he'd be pretty good at that I reckon.