But it's not just that. When you're in a physical office you can see people's workflow to a degree. You can see how somebody gets up to take breaks, maybe you'll get a glimpse on how their windows are laid out, maybe you'll see some useful tool being used you didn't know about etc. There are a lot of things people do that they themselves don't think anything of that can help others improve. If you require the teaching side to actively share what they know then a lot of these things are going to get lost.