Where is the data for this assertion?
Do you know anyone who has got a new FAC in the past few years, without paperwork showing they have gun safety training? Or without being a member of a gun club?
Fortunately BSAC, NRA etc, have recognised the problem and created exam only courses for people with evidence they have done a lot of shooting, e.g. overseas or in Armed Forces, but don't have UK paperwork. Paperwork seems to be essential for a FAC now.
Getting ALQ on a deer calibre rifle, without DSC1 seems rare, unless the FEO is particularly lenient.
If the applicant is a member of a club, then there are other responsible people who will report bad behaviour, effectively monitoring the gun owner. This is why they want to speak with people you have shot with, to find out how responsible you are.
The guidance to FEOs is really the regulator. The Home Office write and amend that guidance as they wish. They are already looking for paperwork from applicants. No need to do anything that creates more paperwork, as the list they need already covers it: they are not going to loosen up the other requirements just because someone passed an exam.
It is all a matter of FEOs and Chief Supers covering their backs. If someone has had gun safety training, then they are less likely to try and shoot a bird in a tree using a rifle, shoot deer out of season, or do other things that are unlawful or a danger to others.
Having some paperwork seems a real pain, but if you think it is a bad thing, go shooting in France with the locals and listen to the stories or see what happens.