Why? Because 10nm is broken and staying on 14nm skylakes till 2022 or even 2023 was clearly not a sustainable route. An this still assumes 7nm doesn't fail as well. In fall 2018 intel specifically highlighted the fact that willow cove is uarch is process decoupled (in contrast to sunny cove). Only reason to mention that is because a backport was already planned.You know what, I'd be interested to hear what you lot have to think as to why such a backport would have been conceived. I can only think of one reason why it would have been, and I really hope it's not the case.
Why are we getting comet lake on laptops? because they can't make >4 core dies on 10nm for consumer products because yields must be terrible.