tucumseh
Whilst I do not doubt your assertion over your observations of said DefStan implementation policy, I do know that any DefStan non-compliance has to be covered by a concession, detailing any relevant impact (risk management - safety case gurus) on all manner of things (including airworthiness) before it can be signed off.
Of course, this does assume that any relevant DefSTan's were refered to in the original Spec/Contract/MOU with the supplier!
SFO