When I load a website I have no idea what third-party assets are being loaded in or from where, and have no meaningful information ahead of time to know what I'm actually consenting to by typing "example.com" into the URL bar. Obviously, my IP will be sent to example.com, and I've arguably consented to that, but not to all the other third-party stuff that example.com might have loaded the page up with.

(this is also the argument around cookie consent: yes, the browser chooses to accept the cookie. users don't really get an opportunity to refuse them, though. So "the browser accepted the cookies" is not sufficient consent, as far as the EU is concerned)