Systemd Absorbs "su" Command Functionality
Found on Slashdot on Saturday, 29 August 2015
With a pull request systemd now supports a su command functional and can create privileged sessions that are fully isolated from the original session.
Lennart Poettering's long story short: "`su` is really a broken concept. It will given you kind of a shell, and it's fine to use it for that, but it's not a full login, and shouldn't be mistaken for one." The replacement command provided by systemd is machinectl shell.
It's not broken. Nothing Lennart "fixed" was broken to begin with. He just comes up with some petty excuses to support his bloatware that turned from an init replacement into a cancerous octopus that tries to take over every other system component.