[dspillett]

> which indicates that the "stable" implementation could still be buggy, but only if you stray away from the common path

Or that the complexity is such that if a new bug is found, it may take a long time to be fixed because of the complexity, or it is fixed fast and has unexpected knock-on effects even for circumstances on the common path.

Something that takes a long time to be declared stable/reliable because of its complexity, needs to spend a long time after that declaration without significant issues before I'll actually trust it. Things like btrfs definitely live in this category.

bcachefs even won't be something I use for important storage until it has been battle-tested a bit more for a bit longer, though at this point it is much more likely to take over from my current simple ext4-on-RAID arrangement (and when/if it does, my backups might stay on ext4-on-RAID even longer).