I’ve had a lot of cases of the years, some that cost upwards of $150 with their fancy metal exo skeleton. The best, by far, in terms of phone protection is the plain ol apple rubber case. Unlike the author, I drop my phone about once a week. When using the Apple rubber case I have not had one cracked screen or bent phone. I had my phone fly out of my back pocket after jumping up (team scored a touchdown) go over my loft second floor railing and land on the hard concrete below. Dust off, keep using. I don’t know if it’s the rubber or apple knowing their phone better then anyone else. I may stray and get another case because it looks cool, but I know for a fact it won’t protect as well.
There was another guy on Macrumors who said basically the exact opposite about his Apple case. His phone ended up shattering inside one of the Apple cases. Drops are just so complicated and depend on so many things. Sounds like you probably just got lucky with your drops. The Apple cases don't even cover the bottom of the phone, I would consider that a major issue if I was really concerned about protection.