Earlier quoted context omitted.
UX for laptops/desktops was solved in the early 2000. In the early 2000, my music library was a few dozens GBs played back using mpeg123 or something. Nowadays it’s a Google Play Music subscription. Things have moved to the cloud, a lot. That’s a huge change in how computers work, requiring some serious UX changes. I too hate gratuitous UI changes, but things need to keep evolving.
Spotify and Google Play Music are a kind of worse version of UI of Foobar2000, with much limited features. There was a huge UX regression coming with the move to the cloud. I'm all for things evolving, but it's better if they don't devolve .
I'm sure there is a way to search, but I think Foobar is maybe built for a different kind of user than Spotify, etc.