Unfortunately, this breaks a lot of custom python programs I was using to facilitate music discovery and to generate playlists for myself.
It doesn’t affect existing apps
> Applications with existing extended mode Web API access that were relying on these endpoints remain unaffected by this change.
Doesn't affect existing apps with extended mode access, for which you have to apply and be approved. Gives you a higher ratelimit so you can ship to production. Plenty of people (me included) build small widgets for themselves without bothering to apply for extended.