I think you need to keep in mind a few things here: 1. Many of the things you mention are kinda complex, and many sites use CMS type setups/SaaS setups where t

I think you need to keep in mind a few things here: 1. Many of the things you mention are kinda complex, and many sites use CMS type setups/SaaS setups where the team creating the site doesn't have that much programming experience. 2. Browser support for novel authentication methods was lacking for a while. I read that Microsoft finally added functionality to Edge to integrate with the computer's login authentication setup, and some of the others are now doable with JavaScript, but they weren't practical there for a while. 3. Most people are still kinda confused about novel login methods, as mentioned in the article in the magic links section.