The point is the individual user doesn’t need to be tracked for advertising to work.
It’s a false choice thinking we need 3rd party cookies or a. special browser based UUID ad profile.
The truth is we don’t need either and advertising can still be effective.
It just wasn't bringing all the excess profits that advertising corporations wanted. So, enter the fingerprinting and tracking. Like a stalker following you around the web, gathering data on what you are and what you might want to buy.