That only works if cookies are infrequent enough, like location data, which they aren't. Also there's no way for the browser to know how the cookie is used. I'm all for a technical solution, but I'm not sure it's possible to do "cruft free" without rethinking some things.

And as far as there isn't any "cookie law" on the books, it's about compliance with data protection and privacy regulation. So the EU isn't standing in the way of the industry to do that in another way.