I can't remember ever finding the exam pass mark to be ambiguous. Nor do I understand why it takes a cacophony of people to set an exam. It should simply be: what is the PPL holder required to know and then simply ask the questions to check that they do.
A bunch of old farts (I am one) who are clearly struggling to put these exams together (I'm not one) need to get switched on and get up to date. I must say though, living in France, all this nonsense is far worse and riddled with widespread personal and out of date opinions.