Maybe the FAA should hire three engineering firms to go over the designs and manufacturing and have them compete to see who can find the worst flaws. Just having one big entity (FAA) check up on one other big entity (Boeing) leads to problems.

The FAA doesn't even do that, they just let Boeing check up on themselves.

That would require another Boeing sized entity in the US, or a few of them.

If P does not equal NP, then you will ~always need fewer engineers to check work done by more engineers.

So you don’t need a Boeing sized company to check up on Boeing.