The sad fact of life is that I fully expect that the iPhone 16's screen or back will still break even with a short fall to a hard surface. I've used iPhones since the original release and there have been only two times I've dropped one onto a street or sidewalk and both times the front screen broke. In one situation the iPhone was in a case and the screen still broke. Both drops were from about waist height.
Plus, they've made the bezel even thinner on the iPhone 16 which probably means that if the glass wasn't stronger then the front and back would probably have broken even easier than it did on the previous generation iPhones.
Of course, the markets seem to prefer aesthetics over simple ruggedness, but I think Apple has a long history of over emphasizing form over function.
That said, I'm pretty close to getting a new iPhone. Mainly, however, as an always-with-me camera to supplement my interchangeable lens cameras. But, that new iPhone will definitely go into a case as soon as I have it.