If you don't track people you don't need to show the banner. You can use cookies for keep people logged in etc.
Cookie banner = we ask a permission to track you.
There is another interpretation of privacy which is "freedom from harassment" and American internet companies want nothing less than the right to harass you and interrupt you from cradle to grave: if they want to build dossiers, it is to harass more profitably.
Until GDPR web professionals fought tooth and nail to keep modal dialogs out of web applications, mostly successfully. Since the GDPR makes the first interaction you have with a web site harassment it breaks the dam for further harassment. Now the average blog pops up three modal dialogs asking for your email address before you can even read anything, often one modal dialog makes it impossible to close the others.
No wonder the world is overrun with right-wing populism. Thanks, EU.
I call bullshit. Like the comment above rightly states, GDPR does not require banners at all. It’s up to the site to decide if they want to abuse collected data for other purposes than what is required. If it was the goal to avoid modals like you say, it could perfectly well be achieved also today. Also, don’t you remember all the popup dialogs and ads that sites had, well before GDPR? So many that browsers had to basically disable popups?