Epic fail, only in your reading ability... again.
Re-read what I said rather than what you think I said. YOu can balance ANY card WHEREVER you want it. I didn't say anywhere that the 290x/Fury had the same design balance, they don't.
The have the SAME NUMBER OF ROPS, they don't follow the same design path. You could likely take almost any given architecture, increase rop/shader ratio, improve top FPS, improve averages as a result but lose in minimum FPS and have lower high res performance.
You've decided based on specious reasoning that the ONLY possibility is memory, while entirely ignoring the architectural differences because it suits your argument, you also compare it to Nvidia cards while claiming the ONLY difference is memory.... which is categorically false. While you keep making false claims I'm going to ignore your silly conclusions based off them.