You do not need a banner, you need informed consent. I'm sure there are other ways of getting consent other than a half screen pop-up with a big red accept button on first visit, but they probably won't get 70% "opt in" rate.
Law: You have to get some form of affirmative consent if you want to do specific often-abused things.
Companies: We'll do it in the most obnoxious way possible ("here are our 853 technology partners... no, there's not a 'deselect all' option, have fun clicking") so people blame the law instead of the industry that didn't want to allow consent at all.
There's always a deselect all option (or rather, the equivalent "accept only the technically required ones"), because it's required by law. Sometimes the operator tries to hide the option. That, too, is illegal.
