Behaviour of "Unfollow Playlist" with respect to playlist limit

[Reverate]

Hi all!

I'm currently working on an app that essentially wants to wipe the contents of a playlist, re-write it with a new set of tracks, and then trigger playout.

I'm using the Web API and my original plan was:

1. Remove all the songs via the "remove-tracks" endpoint

2. add the new tracks via the "add-tracks" endpoint

3. Trigger playing of the new playlist via the "start-playback" api

But when I trigger the play event it will generally not use an up-to-date version of the playlist, and I think this is because the start-playback api doesn't allow for a snapshot ID

So the alternative solution I had was:

1. Delete the existing playlist

2. Create a new playlist

3. Add the new items to the playlist

4. Trigger playout

Now of course, there is no "delete playlist" api, so I followed the docs here which essentially say that there's no notion of deleting playlists within the Spotify system and that I should be using the unfollow endpoint instead.

This proposed solution does seem to work, but I have two main concerns with this approach:

1. Will other people still be able to search for and find the old versions of the playlists?

2. The "create-playlist" api docs say that users are limited to ~11000 playlists. Does each created playlist count towards this number, or does the act of unfollowing remove it from your playlist count?