Ask HN: Why is passwordless authentication not gaining traction?

I play an online mahjong game where users doesn't have passwords. You only need an email account and whenever you want to login you get a one-time code to your email address https://i.imgur.com/RI0PqP3.png

The whole thing... just make more sense? This is nothing special though, just a regular site but not having a password feels more straightforward.