I haven't lost data on btrfs but I have broken half the partitions I made with it. The comparison doesn't feel baseless to me. > 0.001% the real world testing

I haven't lost data on btrfs but I have broken half the partitions I made with it. The comparison doesn't feel baseless to me. > 0.001% the real world testing Statistics can be quite powerful. If you have a million installs, and your billion-install competitor has 100 problems per million installs, you can make some pretty strong statements about how you rate against that competitor. Just for easy example numbers.