I have also a github account and already contacted the people there. No new posts since last Jun.
Anyway, I understood that ZFS don’t like /swapfile, Grub need special “adjustments” and arch-linux-users complain about “to much memory usage”.
On my side I don’t either know exactly the structure of ZFS e.g.:
hardware, ZFS, GPT, formatting
or other way around and nobody has this explained, looking on Ubuntu-ZFS through gparted all I could see was the EFI with FAT32 and root in ext4.
The former approach for installing and configuring OS on ZFS, manipulating scripts in the best case or everything over command line in the worst case and afterward writing configurations-files for snapshot and everything else will not works with Manjaro users and don’t works either with other distry-users too cause of/that means everyone must become ZFS-expert. If we continue follow this way under Linux… as soon one user acquires the necessary expertise will install FreeBSD (or similar).
We have to supply a GUI that permits choose the options not only during the installation (expert installation) but even in the OS like FreeNAS do.
If Grub didn’t perform well use rEFInd or other loader if possible or easier to manage.