Oh i agree and understand why they bottleneck the CPU instead of the GPU.. and you are correct it is an indication of what is left in the tank, but it is kinda skewed when you have a quad non hyperthreaded up against an 8c/16 ryzen, sure the Intel chip might be faster but once you move into the area of more cores required, that Intel chip taps out a lot faster than the chip with more cores does.
This is another reason the i9 9900k is going to be such a monster of a chip, 5ghz across 16 threads is going to be something quite monstrous, as you get the here and now single threaded perf and then as more and more stuff comes along requiring more threads you just add more of your threads into play and keep the performance going.
The only negative for Intel 9900k against Zen is AMD's HT implementation is actually a lot better than Intels, once we start seeing stuff using many many cores, i expect Zen2 at similar clocks to Intel to be faster and then even more so once HT is thrown into the mix. a lot of that will be node advantage, I think Intels 14nm revision is now so strong, that it may take them a revision or 2 on 10nm to bypass it. If AMD match intels 14nm with their 7nm off the bat, or even surpass it, Intel will have work cut out to make up that ground. Especially as i fully expect a refresh of Zen2 within a year or so like they did Ryzen1