Avoiding all sidelines, keeping this simple, for my understanding and for the record and please correct me if I am wrong… Summary:
"cryptsetup close" of root device during shutdownis already implemented.
"cryptsetup close" of root device during shutdownis already implemented.iff your initrd/distro of choice do so. For the root disk it doesn’t matter what systemd does, it matters what the initrd/distro do. hence ping the maintainers of those.