I get the impression that the Surface computers were MS's attempt to show up other Windows PC vendors poor efforts - low res 16:9 displays and shoddy trackpads were the norm - whilst threatening to step on Apple's lawn (specifically hardware suitable for professional graphics applications). It doesn't matter too much to MS if you run Windows on a Surface or on a Dell or Lenovo, as long as you arent running MacOS. It seems to have worked, since mobile PC hardware has markedly improved.
And I'm pleased to draw attention to a non 16:9 laptop (other than a 3:2 Surface or 16:10 MacBook): The Huawei Matebook X Pro - high Res 3:2 screen, discrete Nvidia graphics as an option. Finally!