I strongly agree. There is no legitimate functionality that can't be implemented without 3rd party cookies. Some sites will break at first until they are fixed, and we could have a whitelist for a while, while making it very cumbersome to be added to that list. New sites would simply need to workaround the lack of 3rd party cookies and accept that user tracking is technically illegal.

The surveillance internet is something that was allowed to evolve by a lack of foresight from the standard authors in their desire to build a rich web. We should put an end to it as soon as possible. The browser should not leak unique identifiers in any situation and all standard browsers should be as finger-print resistant as the Tor Browser.

In my view, if you leak data that is critical to the privacy of the user, it's as bad if not worse than an improper implementation of TLS. It takes only two, modestly skilled, collaborating webadmins (one site "shameful" and one used with authentication) to possibly destroy a person's life, reputation and family. A practical attack on SSL2.0 is orders of magnitude more difficult.

Let's put responsibility for privacy back where it should be: on the browsers and web standard authors.