I think it's worth saying that because AMD have only just really hit their stride, Intel were under almost zero pressure to improve which has really hurt them especially with the process.

X86 is definitely a coefficient overhead, but if Intel put their designs on 5nm they'd look pretty good too - Jim Keller (when he was still there) hinted their offerings for a year or so in the future are significantly bigger to the point of him judging it to be worth mentioning so I wouldn't write them off.