> The EU's own government websites have these same cookie banners.
Most of them decidedly don't have the same cookie banners. E.g. in vast majority of cases they don't prevent you from seeing content, and have an easy opt-out mechanism without dark patterns.
The result matters, which is why regulations should be considered carefully. The whole cookie fiasco is exactly that: they created a whole industry of shitty compliance and the rules are complex enough that every engineering team is like "just use the off-the-shelf shitty thing". And here we are.