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Why aren’t motherboards mostly USB-C by now?
(philip.greenspun.com)
This is a most excellent place for technology news and articles.
Most desktop peripherals are still USB-A. For low-power, low-data things like keyboards and mice, what would be the point of USB-C? It would increase the cost of the product but provide no real benefit to the user.
Also, if you had a new desktop motherboard with say 6 USB-C ports, would you expect all of them to be capable of delivering 20V at 5A so they can be used to drive USB-C monitors &etc? Because that's a lot of power to be running across your motherboard, even if you have a power supply that can handle it. You'll need a separate cooler just for the USB-C bus controller, and pray that nothing ever goes wrong with power delivery because it will probably fry the whole board.