To mirror other comments, btrfs is pretty stable now and I run it on my server. The main problems now are with RAID5/6 profiles, the implementation has lots of issues still that can cause data loss[1]. Seems most of the core developers don't use those profiles so it hasn't been getting better. If you want to use RAID it would be safer to stick to RAID1/10[2]
[1] https://lore.kernel.org/linux-btrfs/20200627032414.GX10769@h...
[2] https://www.man7.org/linux/man-pages/man8/mkfs.btrfs.8.html#...