What's a more likely scenario in road cycling: A) an impact causes tire to deflate, which could lead to tire tire unmounting from the rim and breaking as it hits pavement or B) impact causes rim to crack, which could easily lead to a tire coming off?
Seems like the people saying the type of tire retention doesn't matter are assuming scenario B, but the tire being deflated at the beginning of scenario A is a lot more likely to me, and the hooked rim by design has a better chance of retaining that tire than hookless. This is the scenario the CPA is concerned about.