I don't think it's at all reasonable to say that a Slack channel is an "equivalent" to spreading information by ad-hoc meetings in the cafeteria/break room/near the water cooler.
I can reach all people in a Slack channel by spending a few seconds typing something. Reaching any large number of people through chance encounters in an office on break time requires perhaps hours of work spread out over days or weeks. And you'll never reach employees who work in another location if you can only physically talk to the ones who work in your office.
I can reach all people in a Slack channel by spending a few seconds typing something. Reaching any large number of people through chance encounters in an office on break time requires perhaps hours of work spread out over days or weeks. And you'll never reach employees who work in another location if you can only physically talk to the ones who work in your office.