Does anyone pay attention anymore?
The customization for the Jaguar was customized not so much like hardware but more-so like baked in software that takes a lot of the load off of it. This thing is gonna run just like a PC running DX12.
The DX12 takes a lot of the load off the CPU and uses it much much more efficiently than DX11.
As DF/Rich stated in the vid when he asked "Is it a Jaguar CPU?", then answered his own question by saying "Well, it is and it isn't", then stated "I never seen anything like it before"... Yes its based off the x86 but highly customized and built specifically to work with its surrounding components, with the DX12 taking 50% of the load off the CPU for much higher power output. When he compared this to the Ryzen performance speeds the Scorpio's core processor runs almost right up there with. MS customized the SH*T out this thing for optimal performance. And as he stated in the video i posted below, he says MS designed this to run just as a $1000 high end PC would. In this video he explains how much more powerful Scorpio is then PS4 Pro, and also answers you question about how MS took care of the Bottleneck issue.
https://youtu.be/tqvc8M6hpbI
I think we can say MS did their Homework here, i personally am very impressed.