Concerning "rubber stamping" of foreign approvals, long ago major authorities like Australian DCA usually sent a small team of technical specialists to "validate" foreign certifications. We probed critical topics that might have been glossed over by the home authority. We always found deficiencies; usually minor but sometimes whole regs had been overlooked. We always came away with intricate knowledge of the new planes that guided our regulatory efforts for years ahead. Then our political masters asked Qantas if it was worthwhile! One of the reason the practice stopped was because everyone else did it; up until nobody else did it. Now most authorities just wields a rubber stamp. I think the Chinese still do the job properly and interestingly Chinese approval was still pending when 787 was grounded.