I'm not sure what you mean by "open source orgs" or why you felt you needed to create a throwaway account to leave the comment. But, in general, "internal communications channels" on open source projects are something of an anti-pattern. Certainly, private board member (or other person-to-person) communications can be necessary but what you're describing sounds like an unhealthy atmosphere in general if there's a lot of contentious backchannel comms.