I've never used their actual website, it's always been awful.
There have always been 3rd party apps with actual working media keys support
These days, on Windows, the official Pandora app on the Windows store is actually pretty good. On the Mac, Hermes is fantastic.
> For me, and most other people who will be switching, the appeal of Apple Music is the native app and eco-system integration with iOS in general.
If you like Pandora, try the Hermes app.