Hey, grumbling new guy - people like different things. I love this level of ambiguity, and you don't. If you have a hard time believing people like it, you can just ask us why we like it maybe?
Mistwell,
This explains it. Where's the advantage in math mechanics being ambiguous? Especially since they want to promote Adventurer's League; It would not be fun to show up at a table one week to discover that, this time around, your AC is reduced by 3(!) because this particular DM has a different idea about how AC should be calculated with bracers of defense.
Oh, and my name is Eric, jerk.
OK, calling people "jerk" is absolutely not acceptable here. I realise that "grumbling new guy" wasn't exactly friendly, but even so. And Mistwell, making new people feel unwelcome is also not even close to the sort of thing I want to see round here.