Btrfs has not been, is currently not, and unlikely in future to become a general population usable file system, which is a shame as 10 years ago it looked like a promising move forward.

Its window to it was when setting up ZFS included lots of hand-waving. That window now has closed. ZFS is sable, does not eat data, does not have a cult of wizards spelling "RTFM" and is can be installed in major distributions using easy to follow procedure. In a year or two I expect that procedure to be fully automated, to a point where one could do a root on ZFS.