Lovely machines, though they could save themselves alot of time by rounding up some regulars from McDonalds, KFC etc, and if the phones survive in their daily routine, ready for production!

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Human behaviour. If you have always put your phone in your pocket and its your daily routine, you going to do the same with the new phone.
Dont forget, there is a generation of people who grew up with old Nokia's which you could sit on, while in the back pocket and no problems at all. Look up nokia 3310
So we have about 20 years of people taking for granted phones were part of our daily routine and very durable.
Enter the smartphone era, and there are still people who are getting smartphones for the first time, do you think we can cut these people some slack from expecting that a phone should still be durable?
No I don't believe its obvious to all people that they cannot put a $1000 phone in thier back pocket, where they have kept every other phone for 20 years.
To people who never had an old nokia/phone of that era and grew up with smartphones, yup, its obvious to you.
I have Astell & Kern AK240 , just like a phone, designed for pockets. Way more expansive than an iphone, and i can sit on it all day.