I don't understand why this is on the front page. The article has a catchy headline, but none of the points it makes actually substantiate its claim that email

I don't understand why this is on the front page. The article has a catchy headline, but none of the points it makes actually substantiate its claim that email is doomed. It is possible to make email secure (eg with PGP), so we don't have to abandon for security. What's more, everybody uses email. Does the author really think that many people will just abandon it? A Slack account could have been hacked just as well as a Gmail account. And if the admins were so professional that they would have configured Slack to "forget" messages, then they might as well have implemented better security for email. What's more, who says that Slack actually deletes messages? Catchy but lacking in real substance.