I don't want to rub it in, I totally get your frustration! I returned a phone because there was a small scratch on the bottom back that you could see just in a certain angle! I know how crazy this sounds but when you buy something so expensive you want it to be perfect (and rightfully so).
That being said, it's glass hence it shattering like glass. Samsung isn't really to blame here as it never claimed it was solid and shatterproof. And I'm certainly not saying you are to blame either. Those things are portable and therefore proned to be dropped. And I'm really really feeling for you!
When I got my S7 I left it in the box until my case arrived. That's how scared I was of it breaking. In that respect, the last part of your message is the most important: never use it without a case.
So kids: Never use it without a case!
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I bet Samsung will continue to make glass devices as long as they keep selling well.