Plenty of good modern country music out there, you just have to look for it. Tyler Childers and Colter Wall are some famous ones that spring to mind, but there's many others.
I mean that's the case for any genre. Time filters out the bad stuff from the past, the good survives to reach new generations. Now we get to do the filtering for future generations.
I really love "Sarah Shook and The Disarmers" as well. They actually go by River Shook now I think, but the band still uses their dead name.
A bit more on the folk side than country, but "Nick Shoulders and The Okay Crawdads" is one of my absolute favorite bands these days. They just put out a new album too and I can't recommend it enough.
IIRC Fighter Jet Pin-Ups, Mitch King. What I'd do is I'd use Spotify to tune to the song's/artist's "Radio" & it'll pull up a shit ton of songs that have a similar sound, OR songs & artists similar enough that other people also like.
That Spotify algorithm is so fucking well-tuned, man. And it gets better with each passing day.
Meh. Depends on band/genre. There's Green Day is Metallica's kill em all radio for some reason. I love both bands, but they're not really related.
There's static-x and Korn in megadeth's radio.
If you go to cannibal corpse's radio, out of 2.5 hrs of music/40-50ish songs, you'll see 6 songs by cattle decapitation, 4 of which from the same album. For a genre with hundreds of bands, that's piss poor variety. And ofc bunch of other bands in there there aren't death metal such as slayer or venom.