This is misinformation stemming from disinformation propagated by organized industry retaliation to the law. Cookie banners are not and never have been required by law, they are intentional harassment designed to make users oppose laws that actually just say “you may not track users without their consent”. A good faith implementation would be simply nothing, because no explicit consent is required when you’re actually using cookies for honest purposes.
All of the cookie banners have separate categories for strictly necessary, functional, performance and marketing, because those come from the law.
The problem is that people generally want functional and often performance cookies, and then you end up with the stupid cookie banner regardless of marketing cookies.