While Mearls may have thought they were going to have the Bracers of Defense become an AC = 13 + Dex bonus item, his comment on Sage Advice was well before the DMG was wrapped up. Instead, the Bracers of Defense became a +2 while not wearing armor or using a shield. If it was going to set a base AC, it would have been written up in the DMG similarly to unarmored defense or mage armor. It is perfect for a monk, wizard, sorcerer, or barbarian who doesn't use armor or a shield.
Ah. Thanks for pointing that out. I guess the +3 ones that I gave to the party from the LMoP download (which do not stack with anything in my game) should be called Bracers of Limited Defense since they are more or less limited to bracers plus dex.
