I'm inclined to agree with the author, but sadly I think that getting a "little bit of software help" and "maintaining a culture of mindful and efficient commun

I'm inclined to agree with the author, but sadly I think that getting a "little bit of software help" and "maintaining a culture of mindful and efficient communication" is simply not viable in large enterprises that run on Outlook. There are plenty of technical projects that have successfully used mailing lists for decades, and those searchable lists are now valuable historical records, but I have never seen this implemented successfully in a team that did not consist primarily of software developers. At every job I've had, I've built up an organised, searchable and valuable mail archive, and I know many of my colleagues have done the same thing, only for the archive to disappear when I change jobs because there is no way of filtering out personal and confidential material before sharing the archive. At least with Slack you know that group chats are not implicitly private, and the tools and culture allow you to send messages that are visible to everyone without expecting them all to read and respond.