Earlier quoted context omitted.
>I think there's a legitimate FOMO involved with not quickly reading messages. Call me rigid, but isn't the ability to overcome this kind of silly stuff exactly what separates well-adjusted adults from everyone else? When you catch yourself doing things out of FOMO, take your dispositions and fix it. In this case: close the app, or configure the alerts. I'm sometimes alarmed by how people seem to have zero self-knowl…
You're missing the key modifier: legitimate. It's not an irrational fear of missing out; it is a very real concern about a culture where being less responsive on Slack reduces your influence on key business decisions. "Close the app" is only good advice if you both want to and can afford to opt-out of any involvement in those decisions.
I can't even imagine working in such an organization and staying sane.