Not everything needs to be in the Linux Kernel (and honestly i don't care if it is), looking at the past "linux-sound-system-tragedy" i would say, to make something outside linux is often much better (not 1000's different peoples who thinks it's better the other way around, and you are full of sh* anyway).
>His only actual comment against ZFS was that benchmarks didn't look great
What benchmark? Mines are looking pretty good, with a preheated Arc and with L2 especially...actually much better than any HW-Raid. Compared to Linus, there are Institutes with a bit more than a single 3GB git repository, and the crazy stuff...they need verified backups.
https://computing.llnl.gov/projects/zfs-lustre
If he ever has to improve a Lustre Filesystem of 55 petabyte with ZFS, he can come back, otherwise Linus...shut-up* and be happy with your ext4 (nothing against that one).
* A homage to the old linus-style of having a discussion.