I switched to ZFS for a while but had to switch back because of how much was broken. Overlayfs had issues, reflinks didn't work, etc. Linux-specific stuff that just works on kernel filesystems was missing or buggy. I saw later they added support for some of the missing features but they had data corruption issues. Also I doubt it'll ever support fs-verity.

I don't plan on giving ZFS or other filesystems not designed for Linux another go.