Yes, and I still wonder at the sanity of making it the default given the large number of known problems. I've lost data, irrecoverably, with Btrfs on at least

Yes, and I still wonder at the sanity of making it the default given the large number of known problems. I've lost data, irrecoverably, with Btrfs on at least two occasions--the filesystem was completely toasted. More recently I've encountered the unbalancing issue--the filesystem would become read-only approximately every 36 hours with sustained intensive use. That's simply unacceptable--the default filesystem needs to be utterly reliable, and becoming unusable at unpredictable intervals is not suitable for production.