The cited article has a. nothing to do with CoreOS, and b. contains very incorrect information about btrfs, not just a matter of also being outdated. e.g. "btrf

The cited article has a. nothing to do with CoreOS, and b. contains very incorrect information about btrfs, not just a matter of also being outdated. e.g. "btrfs does not allow you to organize subvolumes" has never been true. The article must be old because send/receive, deduplication, and preliminary raid56 support have been there for a while.