It is not the dollars per watt that matters to many users.
What matters more than people may realize is battery runtime. The Apple hardware just spanks x86 hardware, unless that hardware is fitted with a big battery, and or a secondary one.
I typically run Lenovo hardware, and on my faster machine, I got a very large battery and could get 6 solid hours. And that is at a nice 3Ghz speed too.
My current machine (i5) is far slower than the M1 and that hot running Lenovo. (i7) It has two batteries that can yield 5 to 7 hours.
Those machines are heavier, slower, bigger, and just feel crappy compared to the M1 Air I have been using.
And that thing is crazy good. Battery life is longer, sometimes by a considerable amount. It is great hardware, fast, easy to use, light, you name it.