Yeah, I think of Slack as the virtual version of the open office. Anybody can bother you at any time.

In the real world, if we ever return to it, I like having physical team rooms, the sort of thing you have naturally when it's an early-stage startup in a single space. When everybody knows each other and is focused on the same goal, it's not hard to work out good communication and space-use norms. But scaling that up into large open-plan offices can quickly turn maddening. It's the tragedy of the audio commons, and anybody can walk up and tap you on the shoulder.

For me Slack is the same problem, but worse in that it removes some of they physical signals and feedback mechanisms that work in an open-plan office.