Is this an English sentence?
And yet it breaks more than Gorilla Glass?
Hmm... Credibility prob, bro.
Not at all. Harder materials are more brittle. Cast iron is harder than steel, but it breaks to pieces rather easy. Steel is softer, but its much stronger. It bends rather than breaks.
Sapphire is very similar. It is very hard and extremely scratch resistent. But it also shatters relatively easy. On a mobile phone or a tablet, you would have to have a rather thick slab of sapphire to prevent it to break very easily due to the very large surface area. This would make such a device much thicker and heavier than they are now.
This is exactly why you barely see it in applications larger than a watch. And even in watches it is rather thick, despite the small surface area.
Soft = flexible = shatter resisent != scratch resistent
Hard != flexible != shatter resistent = scratch resistent
If you rate it from soft to hard, it would look like something like this:
- Plastic
- Gorilla Glass
- Glass
- Sapphire
Where the first is virtually unbreakable but extremely sensitive for scratching and the last is very brittle but virtually unscratchable.