PJ2
I have seen your arguments on various posts and I believe that fatigue is an issue.
However IMHO to be over the legal limit and fatigued are two separated issues.
Reading the various threads about pilots being over the legal limit always the fatigue issue pops up. Sometimes it sounds more "if I can land the plane after a fifteen hours flight, I can also be over the legal limit without being impaired".
I am not saying that you stated that, but other posters sounded like that.
It is detrimental to the issue of fatigue which has to be addressed without comparison of being over the legal limit.