John Tullamarine: "always one needs to check the frozen certification standard for a particular aircraft before throwing numbers into a discussion."
Most important point in this and numerous other discussions!
Zzuf has the best explanation, at least insofar as it corresponds to my memory of what went on in the Flight Test Harmonization Working Group back in the 90's. Earlier certifications were not required to demonstrate stall at a 1G loading; later certs were and will continue to be.