The quest to find something to help sort my unwieldy Watch Later playlist of almost 3,000 videos continues. No videos load when I try to sort that list, and there's some weird detection issue, because if I try to use it on another playlist, then it'll load the WL list, but only 200 videos. It's the start of a good idea, but it doesn't quite function as desired.

Dude. You did a great job. Just editing a sick playlist by dragging and dropping is not cool. You can just make a text list. And add a reverse button. Normal users usually need to view a large playlist from the end. Too bad I'm too dumb to fork with this button.