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Reading in the sun isn't the same as leaving a device in a car in the sun. You get nasty temperatures in there. Some people bake cookies in their cars. Some people leave their dogs and children and they die within an half-hour. If you reached those temperatures while reading in the sun, you'd drop the reader because it'd be too hot to touch. Smartphones and tablets don't like such temperatures either.
eInk screens are fragile as eggshells. You can break a screen with the pressure of a single finger, it does not take much force at all. You can try this out yourself (if you have a device that is already broken beyond repair). So you should remember that these are touch-screens, which means feel-screens rather than press-screens. They don't handle pressure at all, and torsion is worse as no case protects against that.
Smartphone screens are not as fragile. They have glass but it's usually in the front and for some devices you can even replace the front glass at low cost, as its a separate entity unrelated to the display itself.
There are flexible, supposedly unbreakable eInk screens (on plastic instead of glass) but no mainstream device adopted them which suggests issues such as, high price? lower contrast? I don't know. Until this is resolved, breakage is a risk that comes with the technology.
I haven't broken any of my devices so far, but I bought several broken ones of eBay for spare parts and modding. If I manage to break my Kobo I will just buy a new one.
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