Will mass playlist deletion ever become a thing??

Hi ​@Sanshoku !

If I understand correctly, you have moved to a competing streaming platform and have transferred some of your playlists, and some of your playlists you don't want to and want to delete them.
Now the question is, do you want to delete some that you have already transferred to Spotify or do you want to delete the ones that are still on Deezer?

If you want to delete these on Spotify, then you should ask the same question on their forum.
And if you have some that are still on Deezer, I don't know why you would delete them because you won't be using Deezer.
I have to admit that this is a bit confusing.