On the semi side, it's not that hard nowadays to step down to 20 or even 16 nm. The fab capacity and technical expertise is there, readily available.
16 nm readily available.....
"The fact that the 16nm production process is not yet widely available and ready for mass production would however mean that the first ASIC chips made using it may be pricier, at least until the yield of good chips is high enough. The development of very complex chips with thousands of cores is another thing that will require a serious financial support"from crypto mining blog....
Seriously - 16nm desgin, fab, and implementation would be DRAMATICALLY more expensive and require a tremendous lead time. Obviously Spon has done some amazing things with their current die size, and I can't wait to see these things in real life running. I think it was a savvy business move, and a technical feat to do what they've done. Hats off to them, their engineers, and their business leadership. This is why they are the industry leader.