[sgift]

Correct. Which is one of the reasons many people who transition to management from tech suck at it: Humans are not machines. If they have problems outside their work those problems will leak into the work and will influence it. So, you better try to help them if you expect them to work at their best capacity. Or you ignore it, bleed people out and then cry that no one there does good work, everyone quits all the time and you are such a misunderstood poor manager.

The idea that you can just hire people who will never feel lonely (or have some other problems in their life) is in itself quite amusing.