Comment by rleigh

Btrfs has many more problems than dataloss with RAID5.

It has terrible performance problems under many typical usage scenarios. This is a direct consequence in the choice of core on-disc data structures. There's no workaround without a complete redesign.

It can become unbalanced and cease functioning entirely. Some workloads can trigger this in a matter of hours. Unheard of for any other filesystem.

It suffers from critical dataloss bugs in setups other than RAID5. They have solved a number of these, but when reliability is its key selling point many of us have concerns that there is still a high chance that many still exist, particularly in poorly-exercised codepaths which are run in rare circumstances such as when critical faults occur.

And that's only getting started...