^ I get what you're saying about the playlists being pretty conventional, but as you said - they
do seem like little compilations of music she listens to for pleasure (or maybe in the car). Hence the abundance of (agree - obvious) old favourites. She's mentioned listening to plenty of modern classical music while writing
White Chalk, as well as exploring music folk from various parts of the world, yet these interests aren't represented in these playlists. It almost seems like she wanted to make them upbeat/fun/pleasant to listen to, like a little gift for her fans. You know, when you make a car playlist for roadtrips with friends you don't put Arvo Part or Diamanda Galas or Swans there.

(Or at least that's how I perceive these curations, maybe I'm totally wrong.)
We also have to remember that since the playlists are available for streaming on
two different platforms, she's limited in choices to what's available there. Both Spotify and Apple Music have big libraries but they lack plenty of obscure releases. So even if she wanted to create a mix of her favourite Kosovian folk recordings, they might simple not be available there.
I know she doesn't make the playlists herself - she probably just provides a list and someone from her managment compiles it on Spotify/AM - but who knows what's there on the longlist that can't be found on streaming services.