If a handheld device cannot withstand being dropped, it’s planned obsolescence

Uh, not really what planned obsolescence is.

Though I do wonder how much more durable they would be if corning made it 1 mm instead of 0.4 mm thick.

Manufacturers can also improve durability by recessing the screen slightly into a plastic frame, that way when the phone drops on its corner or side on a hard object, it will reduce the likelihood of it cracking.