You see this kind of stuff all the time. People never actually tested it.

I literally got an email today for a sale. It was something I’d wanted for awhile, but whatever, it wasn’t worth what they were asking. Anyway, I was on my mobile and tapped the link. It required me to login so I tapped my saved credentials. The login button stayed disabled and said my password was empty. Fantastic. As soon as I removed a character from my password, it would allow me to login, but now my phone didn’t prompt me to insert my saved password.

I just gave up. They lost a sale today, but it was clear nobody had ever tested logging in with saved credentials from a mobile device on this major site.