Who else truly "refurbishes" them, at least to the extent that Apple does ? I know with Verizon, for example, their "certified pre-owned" phones are by no means equivalent to Apple's refurbished phones. All Verizon does is do a software reset and 'clean' them up. Now, you could end up with an effectively brand new phone someone had for 2-1/2 days and simply didn't like it and returned it in this case too. You could end up with a more used device as well (not sure what VZW's policy on age/time and calling it "CPO" is).
[doublepost=1499804441][/doublepost] Sounds like a valid reason to not buy devices on 'release day' too. Wait a few months, or even longer, for Apple to get things sorted out better. That won't stop most here though !
In all reality, you might have to wait 6, 12, ? months to see changes. It can take months for a design change (improvement) to make it through their entire supply chain before it is implemented in the actual phones.