I'm working in an open office now. With few exceptions, every single person wears headphones (presumably noise-canceling) most of the day. Some people (especially me) have video conferences from our desks.

For a "hey there" conversation, most teammates have to get up and walk over to someone else... tap them to shake them out of their focus and get them to take their headphones off.

Don't think any of us resort to email, but then again I'm only on one of many teams. We do use Slack but again I don't know how many private Slack conversations occur. (Most of my team is not located here, so everything is Slack, and most of it is in a team channel.)

I'm not sure I have a solid takeaway, but I can say that I'm much, much more engaged with my remote teammates than my local ones.