I've lost my laptops SSD (as in: no longer mountable, only got data out of it with some rescue tools) at some point between 2017 and 2020, don't remember when exactly. I've also had a weird experience where a btrfs filesystem formatted on my desktop PC was not mountable on a Raspberry Pi, and vice versa formatted on the Pi was not mountable on the desktop. That didn't instill confidence either.

On the other hand, I've been running a btrfs RAID1 on two HGST datacenter drives for a few years and haven't had issues with that.