Most people are too arrogant to communicate asynchronously successfully. People think that chat is like being on a telephone or in person and that they can demand one's full, exclusive attention. That is some serious arrogance bordering on narcissism when done in personal conversations. At work, it could me more tolerable, but the downside is that no work gets done. Managers need to start to understand this. If you keep someone's full attention for eight hours a day, you should expect no progress. Of course, managers don't understand this either because they are like everyone else described above. In some places, this is understood. I often go days with only a few slack messages at my work, so it's hardly impossible. Then again, we are a fully remote, async business. If I'm not responding, it's rude to demand that I respond, except for pre-scheduled meetings. Not even for emergencies like servers being down. If you have something urgent, call. If not, wait. It's very simple. It works great.