Think low-hanging fruit, I'd say: 600 Elo could be reasonable for a very new idea with lots of improvements still left to try. AlphaGo's improvement definitely

Think low-hanging fruit, I'd say: 600 Elo could be reasonable for a very new idea with lots of improvements still left to try. AlphaGo's improvement definitely petered out later, the difference between Master and Zero is nowhere near that big. On that basis, the skepticism still seems a bit wrong to me.