This seems like one of those situations where the world benefits from one country doing the homework and moving to protect its citizens. I mean, if another country wants to okay pump and dump scam coins, or bogus medicine, or unsafe cars, they're free to do that. Otherwise, others might as well benefit from SEC, FDA, and NHTSA results unless overridden locally, no? Sure, US agencies not perfect, captured even sometimes, but pretty sure tiny Elbonia doesn't have the resources to vet securities, drugs, or cars.
While broadly true, other countries regulators need to be active and keep the American regulators in check.
The entire episode with FAA and Boeing 737-MAX makes it clear that while Ethiopian regulator can not do airworthiness certification of such a complex plane they can definitely ground the fleet faster than FAA wanted to do.
It is unlikely that FAA would have grounded the fleet until all other major bodies had done so and put it under a lot of pressure to also do so.
Calling your bluff on this one. Other world powers are available if that's really your argument.
It turns out that if you want customers in the US, then yes you have to follow US law.