@kernellogger I'm no filesystem developer but people complaining about unreliability of btrfs always give the impression not having used btrfs for a decade. And people in the trade of filesystem development should know about these folks. So, anecdotal evidence isn't worth the pixels on the screen.
I've been using raid5 btrfs with only one issue for 8 years. And I'm happy with it. I don't do databases on my btrfs, at least no db that requires obscene amounts of disk I/O. But Kent will never know about people being happy or content with the choice of their filesystem. On the other hand, there are people reproducing very old tales of issues with btrfs without any first-hand experience.
He should tone it down a little bit.