One thing we have to remember on performance is the following, according to nvidia Pascal took several billion to develop, amd would probably be lucky if a quarter of that was knocking around to develop their gpu's.
True but as above consumers don't really care about that but also even a tweaked and shrunk (albeit 28nm to 14nm FF isn't trivial to shrink) Fury would have been pretty competitive at this point giving them a bit more time to work on R&D for future generations. I really don't understand the reluctance at AMD to go with the leaner, faster architecture atleast on alternate cycles even if they want to push another approach in the long term.