All phone screens crack.
I've had my iPhone 5C for like 4 years now and I haven't broken its screen yet, I'll admit I scratched up the screen a bit but only the screen protector is damaged so I can easily replace it.
Why not invest in a decent phone case with rounded edges or just try to be more careful?
Phones aren't meant to be indestructible, especially iPhones for that matter.
If screens were made of plastic they'd honestly be more vulnerable to damage since plastic isn't nearly as strong as glass.