[chasil]

Allowing btrfs to run out of space is well known to do irreparable damage.

Keeping it healthy means paying close attention to "btrfs fi df" and/or "fi usage" for best results.

ZFS also does not react well to running out of space.

[Conan_Kudo]

I've been running Btrfs on Fedora for a decade now (and it's been the default since 2020). I have basically never done any of those things and it's been fine. I've had to do more babysitting with my ZFS systems than I did my Btrfs ones.