Realistically I'm not even close to being 100% occupied with work during the work day. Maybe some people can do it, but none of the ones I know. But it's just an idea - not everyone behaves the same. If you hate distractions, I wouldn't recommend it to you.

But yeah, for me that's just organic chat about anything when people are not deep into some task, group lunch, some tech chat about a "new thing", etc.