huh, my sisters new iphone recently cracked after falling out of pocket onto the concrete and she had a protective cover on it too!
I’ve gotten to the point where I think cases may actually be unhelpful.
Buddy of mine dropped his iPhone in a case and it just shattered. Mine fell out of a chest-high pocket onto concrete and there were a couple dings.
Probably just luck of the draw, how it falls and how it hits.