The issue with binding is the larger and more complex your die the more failures you have. But breaking it down to 2 smaller dies that are combined they reduce this since they are already getting relly good yields out of the ryzen7 dies.

Epic is just 4 ryzen7 dies. So no this is not worse bins the 16core threadripper is 2 ryzen7 cores.

But I believe it only when I see it. Especially since the rumors said Threadripper will only have 44 PCIe lanes like Intel, which as we now know was false (and was weird previously because Naples has 128 PCIe lanes).