This is actually not true. I just read the European commission's cookie policy.

The main reason they need the banner is because they show you full page popups to ask you to take surveys about unrelated topics like climate action. They need consent to track whether or not you've taken these surveys

Their banner is just as bad as any other I have seen, it covers most of the page and doesn't go away until I click yes. If you're trying to opt out of cookies on other sites, that's probably why it takes you longer (just don't do that).