[whatwherewhy]

I bet Microsoft would like that - they tried and then after it didn't work out for 2 decades of laptops they started making their own hardware. The 3rd party vendors don't care too much to change the ways they work - they juggle the hardware they put into the laptops all the time, one model-year can have over 100 variants (some Lenovo models go into thousands). Apple has few standard components shared across all products and that's it.