IMHO, you got it all wrong. First there was email, and we had to educate and train people how to use it efficiently. Now we have other tools that allegedly solve the “email problem” and create new problems, that yet require education and training. Explicitly, you need to educate to overcome the “natural” expectations that come with the tool. I wonder how everyone miss this absurd of educating to avoid an obstacle that shouldn’t have been there to begin with. It’s not about the communication style (Slack vs. email, each can be optimal in a different settings) but in smart algorithms that will help us prioritize. Good UX shall be achieved by transferring to machines tasks that humans fail to handle.