ZFS already took off, though. The largest data pools in existence that are on an actual filesystem are on ZFS, nothing else can handle them. And it's only the k

ZFS already took off, though. The largest data pools in existence that are on an actual filesystem are on ZFS, nothing else can handle them. And it's only the kernel part that needs the rewrite, the userspace stuff is fine. Btrfs was started as Oracle's gamble against Sun's ZFS, but then they just bought Sun, ZFS escaped to OpenZFS, and Oracle killed the Btrfs team entirely. Btrfs has never actually outgrown that decision. Oracle, ultimately, was their only meaningful corporate sponsor. You mention Fedora, but ironically, RHEL had it as an alternative option and then removed it. I'll take Btrfs more seriously when it can actually do what ZFS can, and I'm not even really using it to its fullest potential. It has no equivalent features to raid-z/z2/z3, and has no equivalent feature to l2arc and zil. It has compression, but lacks LZ4, and lacks early-abort heuristics for uncompressable data.