Hi Delphine,
Ive just completed your questionnaire and found that I DO refer to some of the regulations you quote, though this is because I have to understand them to monitor performances against them. As you know, I know Annex II quite well and have now moved to Part 21 in some depth. In my current role I don't monitor airports and atco's.
You are right in assuming the top level regs are generally missed out from any ad-hoc quest for information. Why would people go that high? It doesn't concern them and no authority quotes them.
In my opinion, the great majority of directors, managers and qualified staff don't refer to the top level docs, as Genghis suggests and, as Darkbarly suggests, the use of AMC and GM is well beyond most end-users' grasp.