[dietr1ch]

Think about user services in a multi-user setup

Do you want user-level services, or a multi-tenant system-level service? - Who can tweak the service configuration? - How do you ensure there's no data leaks between users? - What about misbehaviour? Quotas, crashes

I think lingering is great here

[benj111]

Off the top of my head. Have a group that doesn't die on logout. So you can have an email Daemon that responds with out of office. And you tmux session can keep running?

I'm not necessarily talking about the Unix concept of a group. It seems to me you want some granularity between 'kill all processes' and 'keep all processes'