I agree with everything else here, but swap files on btrfs should probably be avoided whenever possible [0].

[0]: https://btrfs.readthedocs.io/en/latest/Swapfile.html

Right, you are good to do swap files on btrfs since linux 5.0 or so as long as you follow some rules. Disko thankfully covers all those details for you, but I shouldn't have skipped over that in the piece. I'll make an update when I get a chance.