Yea, I saw that during the WWDC keynote and physically cringed. As the article says, what could go wrong?

There's this standard that is being worked on by the people working on the Passwords app at Apple (They are active on Mastodon, and often talking about that) which will probably be helpful for this feature too: https://www.w3.org/TR/change-password-url/

I mean isn't it either to complex to implement or not a good implementation kind off thing?

A good chunk of people do use devices other than apple eco system one's and if they try to login and then suddenly, you can't!