You have a point. I should have expounded. And for that I apologize.
I once shared your perspective, borne out of mostly only listening to his post Desire albums in passing, if at all. My ears heard a voice that increasingly sounded like a bad impession of Dylan. How come Bob couldn't/ wouldn't sound the same?!
Then one night a friend played the entire Tell Tale Signs Bootleg Series release for me. I was stunned, and slowly began catching up with all I had previously wrote off.
For starters, Street Legal, Love & Theft, and Modern Times stand on equal footing with the JWH and prior recordings we both admire. I could make a case for others but whatever one's preference, there are sublime tracks on (nearly) every release. Add to the mix unreleased tracks from the Bootleg Series and elsewhere, and it's apparent Bob has been a vibrant artist through every phase of his career. Giants walk amongst us, and he is most certainly one.
He addresses subjects in a manner that, when not overt, may elude a secular listener or at least a listener unprepared to listen to Dylan through a biblical lense. If one is unwilling to engage Dylan from that angle you simply will miss out on much of what animates him.
Musically, with passing years, he's employing more sophisticated changes. His vocal delivery and vocal timbre has undergone multiple iterations (like any singer) due to artistic choice and necessity of age. He's no longer mimicing Ralph Stanley, for example, but he never, ever lost his artistic instinct for delivery - amongst his greatest musical contributions - despite his diminishing instrument.
Like Lon, I tend to listen to "latter day" Dylan these days but like Ellington's canon I wouldn't want to be without any of it. Each part of their respective careers enriches the whole.... warts and all.