Such as? I just can't think of another technology that facilitates the async behavior of email messages. I know some businesses just use WhatsApp but I don't love it. Maybe we would mandate everyone uses Microsoft Teams.
I talk to friends on Slack, Messenger, Signal, and WhatsApp. I virtually never talk to someone I actually know on email, a trend that started in ~2014 when I discovered Slack.
I do still use email! But only for transactional stuff, like FOIA requests or scheduling local government meetings.
Ah ok, that tracks with my email usage too. I also use it for more official communications. Maybe this should be titled "It's Time to Give Up on Email [for socializing]", lol.