BRTFS catastrophically failed on me twice.
I have ZFS on another box that failed badly but lost no data... That was with bad ram and a motherboard that was on the "do not use" list for making ZFS NAS boxes. It always recovered the errors
Currently using it in RAID mode to hold large data sets and CCTV footage for my homelab on three drives that have smart warnings for age without any issues at all for the past two and a half years and two Ubuntu upgrades