My main issue isn't actually a single thing that's wrong -- it's the completely and utterly haphazard way many of the features in btrfs have been "designed"[1].

My main issue isn't actually a single thing that's wrong -- it's the completely and utterly haphazard way many of the features in btrfs have been "designed"[1]. Some of these problem they've had seem, to me at least, to be a fundamental lack of a coherent design. That does not bode well for stability, even 10(?) years after its first version. bcachefs seems to have a much more coherent design. [1] "Oh, yeah, I don't know how to handle this code path yet, let's stick a BUG_ON in there! I'm sure we'll figure something out later."