just to go back to FAA and EASA not being critical of each other's certifications. Lets not forget the elephant in the room, which is aerospace manufacturing has a lot of well paid stable prestigious manufacturing jobs and fly the flag for the country. It's also a hard industry to break into requiring huge capital and knowledge. So EASA has Airbus to protect, FAA Boeing. With the politicians that control their budgets and top jobs all giving them a lot of wink wink nod nod to give the home team all the advantages possible. Think of the Russians at the 1980 Olympics opening the huge doors at each end of the stadium whenever the Russian javelin/shot put team were up.
I posit the ground troops at the FAA and EASA came to a detente position decades ago that one side wouldn't piddle in the others bathwater so long as the other side showed the same restraint.
G