I forked youtubedown because it has too many features. I don't want to download any files and I don't want to mux DASH formats. All I want is a script that prints the 360p video url as fast as possible. And JWZ broke support for premuxed video which I added back. And JWZ broke support for requesting a specific cipher which I added back. Basically youtubedown development went in a direction which diverged from my use case.