In the run-up, the best guide to GDPR was UK ICO's guide to 1998 data protection with a few GDPR annotations.
You must live in a different Europe than I do, because I'm pretty sure that most companies that don't deal with the internet, don't even know what privacy they're required to provide. People still regularly use gmail for some business tasks, they openly list data that shouldn't be shared etc. I don't think what you said is true at all. I think most companies simply don't know that they're in violation in some way or another.
The biggest problem with Data Protection was the maximum penalty, and that it had no teeth for data that moved out of area. It simply wasn't enough for the larger corporations to care that much - unless they were purely national. Hence some companies being fined multiple times for the same failings. I don't believe there's a Shell, Philips, Siemens or Glaxo that didn't have awareness, data protection officer and so on.
[0] https://www.theverge.com/2019/1/21/18191591/google-gdpr-fine...