Xorg is indeed a lot of painful complexity. This being said, the software is not Linux specific, and for modern Linux distributions, it is more and more a legacy technology.
Btrfs is NOT constantly eating people data. You have nothing to back this statement.
It's widely used and the default filesystem of several distributions.
Most of the problems are like for the other filesystem: caused by the hardware.
I've been using it for more than 10 years without any problem and enjoy the experience. And like for any filesystem, I backup my data frequently (with btrbk, thanks for asking).
I run Fedora and for legal reasons, they ship a version that has this problem. Have you tried Mozilla's Flatpak build? I use it instead and it resolves all my problem.