Presuming that information asymmetry will hold over time is a bad assumption, regardless of cost of information security controls.
Why have these new collaborative innovative services succeeded where NNTP and > > indented, text-wrapped email forwards for new onboards have not?
Instead of Chat or IM, hopefully working on Issues with checkbox Tasks and Edges; and Pull Requests composed of Commits, Comments, and Code Reviews; with conditional Branch modification rules; will produce Products: deliverables of value to the customer, per the schema:Organization's Mission.
What style of communication is appropriate for a team in which phase of development, regardless of communications channel?