Yours is just scare mongering before a launch and some of us have seen the same thing for the last 13 years - do you honestly think Nvidia and AMD want their reference designs to be that bad,so they have a massive return rate??
If anything from having dozens of different cards over the last 13 years,and having loads of mates who build computers,etc it is usually non-reference designs which tend to hit more issues with cost cutting,etc sometimes. Que,the Palit GTX460 cards which had VRM cooling for review samples and the shipped ones had no VRM cooling so throttled,or the whole disaster MSI(IIRC) had with failing fans on a number of their AMD models.
But since you say quality is important,lets have a look at the PCBs of the two cards in question.
Oh,wait the RX480 looks "better quality" than the GTX1060 I suppose,especially since the GTX1060 uses some soldered wires to connect the PCI-E power connectors to the PCB.
But,I suppose since that is an AMD card,the RX480 must be lower quality overall just cause it not Nvidia right??
I bought a GTX960 4GB over a R9 380 4GB because the GTX960 4GB was better quality right?? Nope,it was better value for money and I wasn't fondling PCB and cooler pictures to see which had a higher BOM for the PCB and cooler.
The same with my GTX660 which I bought over a HD7870 since the mining craze made my GTX660 as cheap as a basic HD7850.
Plus after good old Rollo's quality campaign on multiple forums pre-Fermi launch,LMAO after that.