I don’t believe that every website has colluded to give themselves a horrible user experience in some kind of mass protest against the GDPR. My guess is that companies are acting in their interests, which is exactly what I expect them to do and if the EU is not capable of figuring out what that will look like then it is a valid criticism of their ability to make regulations
Websites use ready-to be used cookie banners provider by their advertisers. Who have all the incentive to make the process as painful as possible unless you click "accept", and essentially followed the model that Facebook pioneered.
And since most people click on accept, websites don't really care either.
Yet that user interface is against the law and enforcing the GDPR would improve it.
What makes you think the regulators didn't predict the outcome?
Of course the business which depend on harvesting data will do anything they can to continue harvesting data. The regulation just makes that require consent. This is good.
If businesses are intent to keep on harvesting data by using dark patterns to obtain "consent", these businesses should either die or change. This is good.