It's not for lack of prescience. Lou Montulli (the guy who created cookies) realized that third-party cookies were being used for tracking and advertising early

It's not for lack of prescience. Lou Montulli (the guy who created cookies) realized that third-party cookies were being used for tracking and advertising early on and made the decision to not to break them. I think his reasoning [1] has stood up well too. [1] https://web.archive.org/web/20170421064522/http://www.montulli-blog.com/2013/05/why-blocking-3rd-party-cookies-could-be.html https://web.archive.org/web/20170421064522/http://www.montul...