This rule is highly enforceable
Evidently my brain works differently to yours, because nobody else thinks it is at all enforceable.
The top people at every European CAA which anybody has asked haven't got a clue what the words mean, either.
Anyway, I am an engineer, and I look for solutions. This also means I don't easily bend over forwards to get shafted, especially when it is proposed by a bunch of faceless shysters in Brussels.
I bought my ~ £10,000 insurance policy earlier this year (learning absolutely nothing useful in the process) but that isn't going to make me go native.