Intel's not the only one who has had inferior performance in DX11. AMD's DX11 driver suffers in drawcall heavy scenarios, particularly in dense open world games like Witcher 3 [1]. In the old days they used to underperform even more. It surprisingly is quite hard to develop a performant DX11 driver.

[1] https://www-purepc-pl.translate.goog/test-ryzen-7-5800x-i-ra...