Because with end user consumer electronics you're buying the thing the manufacturer decided to produce, and most of the time, they've decided to produce an end

Because with end user consumer electronics you're buying the thing the manufacturer decided to produce, and most of the time, they've decided to produce an end product to fulfill a use case, rather than just hardware. I'm sure there will be pure-play hardware companies out there in the "non-PC component" space at some point, but at present most are making end-to-end products.