One of the new customer experience experiments we've been testing as of late is Slack Connect. This idea came from Sara, our external bookkeeper. When we started working with her, she invited us to a "#remotely_accounting" slack connected channel, which lives both in our slack instance and in Sara's. Sara "owns" the remotely-accounting channel, which we use to quickly interact (asking and answering questions, exchanging files), getting work done far more efficiently than we would through email. Practically speaking, she can't access any of our other channels and we can't access hers.