Website operators don't want to have to display cookie banners
This is false. If they didn't want to display the banners they could literally remove them, there's absolutely nothing requiring them as long as they don't track your behavior. They refuse to give up tracking so they add the banners to annoy visitors and hopefully trick some of them into accidentally opting into tracking. It's an abusive manipulation of a loophole in the GDPR. If they really hated the banners they could just not track you but they rather make it your problem.
Browsers already have the do not track header, it should just honor that. If you have that set it should be an automatic opt out no banner necessary.