Again, the rubber gasket coming out is the worst case scenario. Let's say in all failures of the gasket, only 2% come out. But that doesn't mean it isn't otherwise compromised, or prone to it. If the gasket doesn't come out, and the customer doesn't get the watch wet, then the consumer may never know they have defective gasket.
2% seems extremely low. I'd argue that most gasket failures are accompanied by it eventually coming out as the crown is constantly being pressed and rotated. It'll have to give one way or another. Most people may not get their AW soaking wet but they sure use the crown constantly.