I really like the list of scenarios in the post. It is exactly what EU lawmakers should have published when GDPR launched. As often, EU tech-related laws are well-intentioned, but clumsily implemented.
A lot of tech involves interacting with data about people, so the software industry is affected by GDPR particularly hard. That's why you'll have a lot of people on a tech industry news website who may gave to consult a lawyer about the regulation.
Similarly, new traffic safety laws might have logistics companies seeking legal advice, health and safety regulations might have food companies doing the same or financial regulations might have any type of company ask a lawyer about the implications.
Besides, you might not be a layperson. There's a good chance if you frequent this website that you are a professional expert in different ways to store and use data for various purposes. In that case it might be a wise idea to take the time to learn your legal responsibilities with personal data to a slightly deeper standard than most people do.
That is indeed a big issue with the GDPR, IMHO. It is complex, not clear, and most people and even companies are not really sure what they can or cannot do and how to go about it.