When trying to reorder a playlist on iOS, you cannot scroll while dragging/dropping. You have to drag/drop one screen at a time.
For longer playlists, this becomes really annoying, especially since there doesn’t seem to be any easy way to do it on web either.
Use case:
“Dad, please add this one random song to the top of my playlist above all 7000 Taylor Swift songs.”
“OK, the only option I have is to add it to the bottom of the playlist and then drag it to the top one screen at a time. I’ll let you know in about 3 years when I’m done.”