Which sounds a lot like the "DNT" (do not track) or Microsoft's "P3P" (Platform for Privacy Preferences Project) headers. Which both failed, because if companies were required to respect those standards, all advertising and tracking would be extremely easy for users to opt out across the board as a single global preference.

The problem is that each site can choose its own text to display, which buttons/options it shows, and how those settings are supposedly enforced. This doesn't belong in the html of a site. This is exactly what a cross-browser preference should be doing. Which should probably be a modern–and most importantly standardized equivalent–of the P3P header. Every site should have a static set of options it can request, so users are used to accepting or declining the same set of permissions regardless of the site that is visited. Otherwise agreeing to the per-site cookie banner is just as convoluted as expecting users to read Terms and Conditions policies. I have never read the text in a cookie banner, and I never will. I click the OK/Accept button immediately, just like any T&C/ULA.

Imagine if requesting webcam, microphone, notifications, or gps/location permissions were possible by a site including its own custom banner, and if you clicked OK/Accept, it immediately got access to those features. Of course browsers don't allow this, because sites would abuse it and trick users into granting permissions when not desired. Instead, your browser provides a standardized prompt for requesting such permissions. There is no reason for tracking cookies to be exempt from being required to follow the same model.