I personally like seeing the discussion in a public company channel and just set the culture so people know they are not required to join unless asked (but it k

I personally like seeing the discussion in a public company channel and just set the culture so people know they are not required to join unless asked (but it keeps everyone on the same page). Just set some expectations around public conversations so people are on the same page. People can/will still have 1 on 1's outside the public channels when discussing a specific task etc, which is fine. In the end though, this only scales so far, and then having specific channels for specific types of discussions and limiting the membership to those channels is important. e.g. business/marketing doesn't care about development except for timelines, so exclude them from dev channels etc. But for 5-10 people, you aren't at this point yet.