Sorry...maybe I'm dense. Email has worked for decades. If I don't catch something this relevant in an email forum, why would I automatically, without question

Sorry...maybe I'm dense. Email has worked for decades. If I don't catch something this relevant in an email forum, why would I automatically, without question, see it and understand its relevance in chat, Slack, etc. Serious question, since in my experience even specifically assigning someone a Jira tix doesn't guarantee they'll actually look at it and act.