RekordBox doesn't even run well on Windows, so hard to imagine what worse looks like.
But yeah, if Mixxx (or other FOSS software) could offer writing playlists into USB sticks, I'd get rid of RekordBox yesterday because few software out there works as bad as RekordBox.
Unfortunately it's far down my priority list given the cost, my unfamiliarity with Mixxx development and that I rarely do anything without Mixx.
But this is absolutely what ecosystem grants/bounties should be for.
* https://github.com/kimtore/rex
* https://github.com/Holzhaus/rekordcrate (Current status of export: https://github.com/Holzhaus/rekordcrate/pull/103 )
I'd be down to fund a bounty/grant for this (and I'm clearly not alone), if anyone is looking for booty :)
BTW, the DJ collective I'm with has Pioneer CDJ. If anyone need use the hardware let me know. I'm trying to get them to start using open FOSS software, but it is hard.
Without the Rekordbox beat analysis, you'd only be getting track names, and you can achieve similar functionality on the Pioneer side by just putting the files for a each playlist in a separate folder.
There's a kaitai bin format parser config file for the usb db file but kaitai isn't expressive enough to read it properly from that.
Pioneer (err Alphatheta)'s stranglehold on the industry is a shame due to lack of interoperability, among other issues with Rekordbox.