If the legislation is principle based or overly broad so as to cater to the notion that it will be enforced in an ethical and moral manner the purpose shall be defeated.
As such, there shall be no manner in which the individuals who are regulated will have any sense of how to comply with the legislation and ultimately this undermines the rule of law as well as the respect of the public for such legislation.
Such legislation that sets out fines and penalties, especially the absolutely ridiculously high penalties provided for by GDPR, must be as precise as possible so as to ensure the public knows exactly what is prohibited and what is not. This is notwithstanding the fact that this marvelous bit of administrative madness has the ability to bankrupt any organisation up to and including developing countries.
To trust that the executive body will apply regulations in an ethical and fair manner is a rather paradoxical view especially when such regulations also include mechanisms for judicial review and public control. Thus, legislation which claims to be fair and ethical is also, by the same token, providing measures in case the system is abused, which is again rather paradoxical.
These are not apples and oranges, this is a massive administrative monster that container penal sanctions and as such must be rule based based on basic legal principles that apply in pretty much every jurisdiction, European or otherwise.