I’m not opposed to sending an email back either, but that’s not the method of communication we are used to at my place of work. Those emails are for interactions with outside entities most of the time. And email filters can work but just glancing at what I have every couple of days is enough to know I don’t need to worry about what’s going on in emails. They’re backup to other systems that are in place that will alert is to critical issues.
Again though, we don’t really have people miss slack messages. I’m suspecting this might be like the way some people say they use signal/Messenger/WhatsApp/SMS. People/companies just communicate differently and we just have different experiences within our lives. I posted my initial reply with that intent but I probably didn’t make that clear.