I've only used BTRFS a handful of times and I've still had three filesystems die on me. Two became cripplingly slow, probably because of automatic snapshots (even though there was a small retention limit). One was fine until it suddenly got into a state where it can only be mounted read-only or mounting never finishes, despite a lot of parameters thrown at it trying to fix that. The first two were not terribly long ago, and the last one was 2018.