Naah, systemd is not bothering me at all, i dont have issues if they change the way how resolve information is stored.

What bothers me that the old way is still there (/etc/resolv.conf) while it is being generated by systemd. I can accept the change where the dns information is stored. Fine, it is no longer the same file, I dont care. While on the other side, if I get parallel mechanism, that is keeping the old, this is really an annoyance. That is hard to identify.

The ZFS has nothing to do with systemd and I havent even touched stuff like jails/lxc, byhve/kvm, memory consumption, quality of code,... as I have said it, it is subjective and it is about trust into operating system. Linux distributions dont have it. They blew it just too many times. BSD didnt.

It is hard to be objective there, just try the BSD. And please do report your findings.