Considering the ball companies send the samples to the USBC for testing, and not the USBC randomly selects ball X and ball Y for initial certification, the ball company controls the process and the ball company can control what balls are sent, so there is a real possibility that any ball company is knowingly sending a ball that they know will pass.
I hear ya on no exacts, but show me in the USBC rule book that states a lane has to have oil from board 10 to 10, or has to have X units of oil across X number of boards. There isn't, but there is a rule about what a ball can have for an undrilled diff, a specific amount.
Just because the PSA is not 6 3/4 on every Crux does not mean that it is illegal. Just because a mass bias spot is mismarked does not make the ball illegal, or a mismarked pin, cg, or a "pro pin" or a pro cg"...but a ball with undrilled diff of .060 or greater is illegal.