You are asking for sanity and ethics on the net. From advertisers. You must be insane.
I don't like this FLoC proposal either but to me I see it as a small leap in saying goodbye to mass cross-site spying that has been uncontrollably rampant with no present working solutions.
FLoC is a tracking mechanism. By replacing 3rd party cookies, this generally speaking means less tracking. 3rd party tracking + FLoC = bad bad. FloC only = less bad.
Browser Cookies are inherently more ethical when used properly.
More of my public thoughts here:
https://www.remarkbox.com/remarkbox-is-now-pay-what-you-can....