Yep, I know that, and you're right it's a very confusing UX that's easily invoked by accident.

There really should be at least a modal to confirm if the result will mean deleting more than say an album.

If you're offline or on roaming mobile data (not sure if they can reliably determine this though, at least not on iOS) when invoking it then they should make you answer a somewhat complex question to confirm that you indeed wanted to delete the songs.

Really makes you wonder what "designers" get paid for.

A product manager needed to change stuff to justify their job. A designer who isn't changing things that the product manager wants changed is replaced by one who does. Therefore, designers get paid for doing what product managers want.

Sometimes the changes get A/B tested, sometimes they don't. Sometimes the A/B test is gamed, sometimes it gets gamed by accident, and sometimes the tests get ignored when they are clearly wrong.

Finally, sometimes the directive is "get people to stop using this feature because it's unpopular with management".

Case in point, that time when Spotify removed all references to the word "queue", and replaced it with "up next" while also changing the behaviour of it. Ridiculous change which they eventually reverted thankfully.

Or that one time when they removed the "set as current playlist" feature, which they still haven't restored. That feature was the only way to change playlist without breaking in the middle of a song, besides literally waiting until a song is over and doing it then, wasting time.

I like Spotify, but they do some infuriating things sometimes.

Don't get me started on their beef with Apple which has resulted in my HomePods still not being able to take music requests via Siri almost 3 years after I got the first one.

It's even worse for playlists that change (daily mixes, made for you, or curated playlists).

When updating them, Spotify will first delete all old songs and then try to download the new ones. If a lot has changed and you're on a spotty Wifi connection this effectively deletes everything. Happened to me several times while on vacation.

There is the solution of enabling offline-mode before leaving for vacation, but as you mention it's very easy to accidentally disable it and once it's disabled all your playlists are toast.