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.
Whiled I loved Cas's character, they removed him for the right reason, I wish he didn't behave like he does because his loss on the show really fucking sucked.