Someone at https://t.me/shortcuts_es asked about making a shortcut for https://spotifydl.xyz, a site I didn't know (I'm not even a Spotify user).

It turns out that it was quite easy to make Shortcuts act as a significantly better interface for the site:

• Select which tracks to download
• Get a notification when a track isn't available
• Adjust the bitrate of the downloaded files (import question)
• Save tracks with the track number in the filename
• Fix problematic characters that don't allow some downloads

NOTE: The website seems to require playlist URLs with the "si" parameter (i.e. they have an ?si= in them)

Enjoy it while it last! ;-)