Just adjust it if you actually need the RAM and it isn’t relinquishing quickly enough.
options zfs zfs_arc_max=17179869184 in /etc/modprobe.d/zfs.conf, update-initramfs -u, reboot - this will limit ZFS ARC to 16GiB.
arc_summary to see what it’s using now.
As for using a simple fs on LVM, do you not care about data integrity?
relatable
Nor imply it. Idiot.
When one finds oneself advocating for a contentious position—particularly one with irreversible consequences—without having engaged in rigorous intellectual due diligence, it becomes imperative to pause and examine the foundations of that conviction. The casual acceptance of collateral damage in matters of state-sanctioned execution suggests an intellectual framework built more on intuition than careful ethical reasoning.
You might want to lower your expectations a bit. :)
I hope you find the help you so obviously need.