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There is no doubt that the glass on the iPhone makes it strong and near scratch resistant. The problem many face is that when the iPhone is inevitably dropped at some point, the glass smashes and renders much of the device unusable. Stronger plastic would make the screen less scratch resistant, but more durable when dropped.
Having said that, the Gorilla Glass used in the iPhone and iPad is 80 percent the size it was, lighter, and thinner, but offers the same strength as before. If Apple's component chain can offer even stronger, non-laminated shatterproof glass to prevent sharp edges and injury, it would be a blessing to iPhone users worldwide.