Could we add a "(2013)" to the title? Also, can anyone speak to the current state of affairs with respect to ext4, xfs, and btrfs? I'd love to hear about the t

Could we add a "(2013)" to the title? Also, can anyone speak to the current state of affairs with respect to ext4, xfs, and btrfs? I'd love to hear about the tooling and code quality in these file systems from an informed (and recent) point of view. Has Redhat been putting out fires since the switch? Did it go unnoticed? Are there measurable performance and/or reliability gains?