hashworks parent
RAID5/6 is still quite beta in btrfs. mdadm+btrfs is the way to go here.
Actually any RAID is beta in btrfs, but configurations with one storage device (e.g. firmware of Turris Omnia) do quite well on prod.
No, it's not beta. You can check the status here https://btrfs.readthedocs.io/en/latest/Status.html
Only raid5/6 has known issues.
This was also about 8 years ago. It was originally a RAID1 setup, but I did an in-place converter to RAID6, which is cool. And like I said, I didn't lose any data.
With mdadm, I don't get auto-repair on top of the checksumming.