[cmurf]

I think the main issue here is Btrfs is still developing. Its kernel doc file still says it's for benchmarking and review. [1] CoreOS devs decided to switch from Btrfs to overlay(fs) about 17 months ago. That's a long, long time in Btrfs development "years" that's how much development happens on Btrfs. But I can't say if CoreOS would, had today's Btrfs been what they were using in 2014, would have changed their decision.

RH/Fedora are very dm/LVM thinp snapshots with XFS centric for backing their containers. I think what you're seeing is distros are doing something different with their container backing approach in order to differentiate from other distros. Maybe it's a stab in the dark or spaghetti on the wall approach but in the end all of these storage backends are going to mature a lot in the interim, so ultimately it'll be good for everyone.

[1] https://git.kernel.org/cgit/linux/kernel/git/stable/linux-st...