Because most people would put a case on it, making it even thicker? I mean, I spent ~$1500 on my last phone, and while I treat it carefully, I'm not risking it getting smashed so I could never go without a cover.
I would totally use my phone without cover. $1500 or $300 I'm not going to resell it anyway, so scratches and wear aren't an issue. But I'm going to put it on a table a lot and I hate it when it wobbles.
