Renames and hard-links are not obscure features. And there are myriad mount options for tailoring performance vs. crash-resilience/posix-compliance to the appl

Renames and hard-links are not obscure features. And there are myriad mount options for tailoring performance vs. crash-resilience/posix-compliance to the application in most the existing production filesystems. Which was honestly another aspect of the talk that was somewhat lacking; what journaling modes were used? barrier/nobarrier? was it even made equivalent to what betrfs achieves? We don't even know if a betrfs instance can successfully mount after a mid-write hard reboot.