Re: yes, yes and thrice, yes!
Of course this should have been standardized in a protocol like HTTP, TLS, HTML, CSS, etc. It should be a browser setting and websites can dump 90% of their javascript that is dealing with ads, consent, and other legal crap. What I hope though is that if this is legislated, it will not legislate cookies, but legislate banning tracking and selling your data, which is the real problem. Cookies are just one of the many technical means to track you. We would not like ad companies in use other sneaky ways that are not cookies, but still track you and sell your data without you knowing.