I already found a thread asking for playlist sorting & searching, which I think would greatly help to find and remove specific songs from playlist without having to scroll through and manually find the song in a playlist that could be thousands of songs. That feature, if implemented, could solve this problem.
But failing that, or just as an extra QOL feature, I think it would be nice to simply have a button inside the little 3 dots button that lets you directly remove the song from the playlist, provided you are listening to it within that playlist
Apologies if this has already been requested, I did take a look but didn’t find anything