I think the distinction between async and sync messaging is really critical here and highlights a different form of communication that folks are incorrectly using Slack to solve.

When I was at Facebook, this type of communication was extremely abundant and took place on Workplace. When you are pushed information, there is some expectation to respond (as highlighted by the author). However, Workplace's opt-in type of communication via feed didn't have this problem. And interestingly isn't really prevalent outside forums and groups (which I don't think are used commonly at companies).

I think splitting out that kind of behavior was beneficial, it wasn't email (which is a push that people ignore), but rather a subscribe where there was no stigma to be late, and people could take their own time to catch up on posts.