So it's a slab of thin aluminium and glass and you sit on it and are surprised it bends / cracks - really.
Guess if you sell 10m phones in 3 days you have to expect this. Samsung will have the same issue but perhaps only sell 10m phones in a year so it's not going to make the news.
Bottom line is they did not ship that way (clearly) - you have to put a lot of force on them to bend - so it's a case of accidental damage. Just in the same way that Apple can not make a phone immune to damage if you drop it from 2m (approximate ear height) onto concrete.