That's not how any of this works at all.
We all saw a delayed ship with the iPhone X last year, because of low production yield. We also know more about the AirPower delays, for a product that may or may not ever ship. Apple has delayed iCloud Messages, group FaceTime and dual SIM for later dates. Apple delays frequently when the quality isn't there to match their standards... and probably more so in the last 2 years.
Yes, poor decisions and mistakes are made, but this is not a small company making hedges on how crappy their product can be and still launch. Nobody is crossing their fingers. Nobody is trying to hit a random date.