Previously: long running process continues running after you logout. Recent change in systemd: Process is reaped once your login session ends (depending on flags passed via ./configure when systemd was compiled, your distro of choice might not be affected right now).
You could interpret this as "breaking user-space", as it's contrary to long-running practice and user-expectations.
Or you could say that systemd is superior as it's reliably cleaning up unwanted lingering processes which may have bothered some before. And this is worth the hassle of explicitly running intended background processes via systemd-run(1), or adding code to e.g. tmux/screen doing the equivalent via the dbus-api.
You could interpret this as "breaking user-space", as it's contrary to long-running practice and user-expectations.
Or you could say that systemd is superior as it's reliably cleaning up unwanted lingering processes which may have bothered some before. And this is worth the hassle of explicitly running intended background processes via systemd-run(1), or adding code to e.g. tmux/screen doing the equivalent via the dbus-api.