It's not widespread because it adds extra steps for those who do remember their password (switch tab, wait for email, open email, click link), or for those who

It's not widespread because it adds extra steps for those who do remember their password (switch tab, wait for email, open email, click link), or for those who don't have their email client open (go to gmail.com, log in, open email, click link). Marco's audience likely reads the magazine from within the appe (where the practice is keep the user logged in indefinitely) or they always have their email client open.