Still more stable than btrfs. btrfs is also dead slow

I agree with this sentiment.

Btrfs has destroyed itself on my testing/lab machines three times during last two years up to point where recovery wasn’t possible. Metadata corruption being main issue (or that’s how it looks like to me at least).

As of now I trust BCacheFS way more. I’ve given it roughly the same time to prove itself as Btrfs too. BCacheFS has issues but so far I’ve managed to resolve them without major data loss.

Please note that I currently use ext4 in all ”really important” desktop/laptop installations and OpenZFS in my server. Performance being the main concern for desktop and reliability for server.