“Stronger” is a term than can mean a couple of things. The two main properties of “strength” are hardness and break resistance. The problem is that usually, whe

“Stronger” is a term than can mean a couple of things. The two main properties of “strength” are hardness and break resistance. The problem is that usually, when you you increase hardness, you make the glass less resistant to breaking. The glass becomes more brittle. Phone makers have to balance those two properties when designing their phones. Making glass thinner would actually make it less likely to break as it allows a little more flex to the glass. Making it thinner might compromise some other property of the glass so I’m not sure why they don’t use super thin glass.