Earlier quoted context omitted.
I'm not saying that the alternatives are better than email (e.g. at my job, Slack has replaced email for communication, and Gitlab/JIRA/Confluence/GoogleDocs is used for everything that needs to persist). The focus has shifted away from email for communication (for better or worse).
A point that I don’t think is being appreciated here is that email is still fundamental to communication between organizations, even if they are using something less formal internally. One’s nephew might not interact in a professional capacity with other organizations, but many do.
Even our clients use slack to connect, it is many times better then emails.