so I can just download all the files in my playlist at once. it could be useful

hell yeah
it would safe so much time
but it could also put alot of strain on the band width
maybe make a mirror of all battles or torrent type stuf idn

good idea but super abusable

you can try this: https://www.downthemall.net/
you can set a filter for all links in the playlist page to be "Donload" to download all the source file
for downloading mp3 renders in a playlist it's a bit tricker, you may need something like a script. here's a command line thing you can try if you have a bash/zsh/etc. shell, lynx and wget:

lynx -dump -nonumbers "<playlist url>" -useragent="<any nonempty string>" | grep -Eio "^http.*donload/[0-9]+/" | sed "s/EntryDonload/MP3Donload/" | xargs wget --content-disposition

you might actually need a script if you want the files to be in order..
be a good netizen and leave some bandwidth for everyone else!

if you could just donload playlists as m3u files, it would probably be possible to use that as a sort of download list for wget or a download manager or even a media player

also, if we had torrents, it should in theory be possible to create a .torrent out of a playlist since bittorrent v2 supports deduplication

@damifortune expecting server errors (503, 404, etc.) after this being implemented much more frequently...

@vikispod in some old threads here you can find torrents being mentioned, i think the issue is keeping them updated daily (for example)