I think the logic's irrefutable.
Screw-down crowns eventually wear on the threads, together with wear on the pendant tube threads. This happens when the crown is screwed or unscrewed so it stands to reason that the more times this happens the sooner it'll fail.
I`ve replaced several damaged pendant tubes and crowns where the threads have become worn and failed. They've all been automatics, can`t think of a failure on a quartz. My own quartz pre-Bond Seamaster Pro is around 30 years old and the pendant tube threads are still fine, probably because the crown gets used 2 or 3 times/year.
The robustness of the design also plays its part, some could be a lot better.
Unless a watch is specifically designed as a diver I don`t think it should have a screw down crown, it's another source of trouble waiting to happen.
Paul