Well, if we're into scoring the performance of aviation safety regulators around the world, the FAA / Boeing setup is the one that has demonstrated fatal inadequacies.
Give them their due, the Chinese aviation authority was the one to call "bollocks" on the FAA / Boeing's assurances after the 2nd MAX crash, and in the view of the rest of the world's regulators they were quite right to do so (especially after the Chinese shared what it was the Americans had said to them).
There is a competitive advantage in having an effective regulatory body - stern but fair is a good place to be. If the Chinese have got that, they're motivated to do it properly, not improperly.
And let's not forget airlines. When they buy aircraft, most of them don't naively take delivery and put them into service; they get their own folk to give them a thorough going over (especially if they've bought from Boeing, looking for ladders and smaller FOD in tanks, tail cones, etc). If there are problems with the aircraft, they're unlikely to be wings-falling-off or similarly gross issues. Thereafter, airlines own engineering reports and operational statistics will contribute to a post-entry-into-service verification of the certification. Airlines buying a new type from a new manufacturer are probably going to want to be all over the manufacturing of their aircraft anyway, to be sure they do actually want to part with cash on delivery.
There is a competitive advantage for airlines doing that - in helping a new manufacturer get a new type safely established in the market, there's probably a lot of discount available forever more. So an airline with the technical engineering resources to be able to contribute in that way may very well be motivated to use those resources to get that #1 customer status.
Lufthansa are a bit like this - they do a lot of their own engineering, because they want to be able to sell engineering services to other airlines. In fact, they pretty much bought 747-800 (the last but pointless 747) to ensure that they could provide engineering services for other -800 customers, the pity being that there are very few of those...