This is actually the worst post I've seen on medium so far.
Coordination is a major use case of email. Whenever you ask someone to do something, or in another words say send you something - language wise you are making a request - its the same construct as that of a meeting - the action is different.
For more complex transactional issues where some parties may be using email, there's ticketing/CRM. Once an issue is resolved, you close the ticket, which may log somewhere else. Generally these systems are more one-sided, where an individual interacts with an organization, and there isn't always much visibility into the ticketing state from the outside.