Have you seen Linus Torvalds' comments on ZFS from 2020?

https://www.realworldtech.com/forum/?threadid=189711&curpost...

".. there is no way I can merge any of the ZFS efforts until I get an official letter from Oracle that is signed by their main legal counsel or preferably by Larry Ellison himself .. Don't use ZFS. It's that simple. It was always more of a buzzword than anything else, I feel, and the licensing issues just make it a non-starter for me. .. The benchmarks I've seen do not make ZFS look all that great. And as far as I can tell, it has no real maintenance behind it either any more, so from a long-term stability standpoint, why would you ever want to use it in the first place?"

BTRFS: RedHat has removed all support for BTRFS and deprecated it: https://access.redhat.com/solutions/197643

BTRFS, "Linux's perpetually half-finished filesystem" by ArsTechnica: https://arstechnica.com/gadgets/2021/09/examining-btrfs-linu... with many problems still unaddressed in 2021 dating back to 2009.