This is such a good point that I hadn't even realized til just now. I'm a pretty tech-savvy user and was never able to really figure out how it worked, or at least how to make it work for me. Can't imagine the average user's experience!
Isn't this something that technically already exists? It seems to me the government is demanding thst browsers have that capability; not that the companies would have to use that feature. But (1) it may actually not be technically possible right now? Or (2) the wording is confusing enough that it is essentially forcing the use, not just "having the ability"