There’s certainly a place for messaging, but email is still the centralized communication portfolio for many things that happen in our work and personal lives. When you want to reach out to a new client, you’ll use email. When you need to file your month-end expenses, you’ll find those receipts in your email. Email is still the focal point for containing our digital memories and footprint; and for most of our outbound, cross-organization communications.
I’d add a few dozen things to that list.
I’m not so sure we’re in a “golden age” of email so much as email has been incredibly useful for a long time, still is, and there is nothing anywhere close to unseating it.
Even the authors own thing isn’t trying to unseat email, just incorporate it into a new tool.