Interesting thread - and lots going on. Let me throw some more on the pile...
I was lucky to grow up in a house with parents who listened to a huge variety of music. My folks were in radio before (and for a while after) the dawn of formatting/required playlists. Needless to say, they went to a lot of shows, knew a lot of music, and had a massive collection - 3,000+ for vinyl and a couple thousand CDs when it was all said and done. Point being, I grew up hearing jazz, blues, 'traditional' funk, fusion, classic rock, new wave, americana, the list goes on.
The best part of this was that my parents would play and suggest stuff all of the time, but they also encouraged me to discover my own stuff. When I hit middle-school & started branching out, my dad would pay attention to 'new' stuff I was listening to and try to identify some influences/roots. Then we'd go sit in front of the record-wall and pull a stack of vinyl to check out based on those influences. Along with that, it turned into a trade as I continued to explore. I would give stuff to my folks, they would suggest stuff to me. It was collaborative musical growth.
I'm guilty now, as many are, of having the bulk of my knowledge in certain genres/eras. I try to explore new & old, but it's hard to drink from a fire hose. And there's certain emotional/experiential connections to music that you listen to at formative times. You can grow that library, but you can't recreate it all the time. So I think this leads to two things. First, certain people feel that music 'just isn't what it used to be', which is not a unique experience. You simply can't go back and recreate that feeling of an album you listened to when you got your first car, had your first breakup, went on your first road trip, whatever. Second, younger artists will often have their formative musical experiences ingrained in their DNA. i.e. The styles they listened to probably influenced the music they learned on an instrument. Furthermore, the music they learn and love to listen to will inevitably come out when they write or perform - how that rears it's head varies widely from tacit influence to seeming rip-off.
The point is, I think that sharing & cross-pollination of genres is happening in a new way with digital media, youtube, file-sharing, online collaboration among musicians, etc. It's easy to say new artists are just buffing out the edges of styles introduced in years past, but that seems dismissive to me. I'm more of the mindset that some newer artists are just working from a totally different palette, because they've had the ability to consume much more media than generations past (generally - I know there are always exceptions). The downside to the digital media fire-hose also has an upside. The downside is ADD, diminishing appreciation for albums verus single tracks, etc. The upside is that a kid getting into the blues can go down the rabbit hole and obsess over the history of Robert Johnson while diving into all of his known recordings. There's two sides to every coin.
Since Vulfpeck is an example thrown around in here, I would look at their interviews and commentary on influences. They cite a lot of different stuff (Stuff) and seem to pay homage while trying to add their own thing. I don't love all new genres of music, just like I don't love all past genres. Still, I wouldn't dismiss the creativity or originality of an artist just because it has obvious influences from the past. That's just a natural part of the creative process.