This is a great comment. Thanks.
In my case - indeed the name is a historical baggage, I'm not arguing for or against it.
Indeed we had regularly situations that we had to pull in experts from other rooms, to discuss specific topics (like TCP), so we should have forwarded the conversation at the start.
But I don't think this should be categorical. There is value in non-experts responding faster (the channel had good reach) by your non-expert colleagues than waiting longer for the experts on the other continent to wake up.
Maybe there should be an option to... move conversation threads across channels?
I think there is place for both - unstructured conversations, and structured ones. What I don't like about managerial approach, is that many managers want to shape, constrain, control communication. This is not how I work. I value personal connections, I value personal expertise and curiosity. I dislike non-human touch.
"You should ask in the channel XYZ" is a dry and discouraging answer.
"Hey, Mat worked on it a while ago, let's summon him here, but he's in east coast so he's not at work yet, give him 2h" is a way better one.
I know that concentrating knowledge / ownership at a person is not always good, but perhaps a better way to manage this is to... hire someone else who is competent or make other people more vocal.
And yes, I don't like managers trying to shape communication patterns.