Actually, i picked up Dylan as an example and I've never been a Dylan fan as well.
Of course, I never listened to Justin Beaver then I cannot judge but, if anything, i find it weird to compare a true piece of hystory like Dylan (despite I don't love him myself) with a huge catalog of music spanned over several decades with a youngster who, at least to me, is a mr. nobody with a catalog made of a few albums spanned over about 10 years.
Also, continuing with the Dylan example, it's almost 60 years he is selling his music and he will likely keep selling in the future but who knows if, in 50 years (but also in 30 years) if people will remember about this young songwriter? I believe his actual "target market" is mostly made of teens and youngsters, true? I doubt adult/mature people do know who he is... I am turning 50 in a few months and never happened to listen to any of his songs and I am quite sure I would not like them at all. How songwriters can be interesting for those of us who happened to enjoy songwriters back in the good old days? Think, i.e., about Ed Sheeran who is another young songwriter who's considered really good by a lot of people... well, to me it's just nothing interesting... all the good stuff about this kind of pop/folk/songwriters music was just done decades ago and, unless you try to make something new and radically different, which would mean you're doing another genre of music, you just cannot go on with the same recycled ideas... i mean, once you tried any possible chord sequences and the obvious vocal melodies to put on them, that kind of music is over... and I believe it's over since quite some time now.
But, maybe, the truth is that I am simply getting too old... don't I ?
Go figure... this evening I did put on my turntable these 3 vinyl LPs in a row: Animals, Wish You Were Here and Dark Side of The Moon... if it wasn't time to go to bed, I'd go on with the Beatles' LPs!