I think people are underestimating the difficulty of developing high performance microarchitecture for GPU or CPU. A new clean sheet design architecture takes

I think people are underestimating the difficulty of developing high performance microarchitecture for GPU or CPU. A new clean sheet design architecture takes 5-7 years even for teams that have been doing it constantly for decades in places like Intel, AMD, ARM or Nvidia. This includes optimizing the design into process technology, yield, etc. Then there is economies of scale and price points. Recent examples: * Nvidia's Volta microarchitecture design started 2013, launch was December 2017 * AMD's zen CPU architecture design started 2012 and CPU was out 2017.