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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.
You can't fit as many components on smaller boards and the components are more expensive to produce.
And if you're spending all that money, why not get the bigger board that allows you more options/room to grow in the future? I imagine SFF PCs are more common for dedicated builds or aesthetic reasons
The boards that do exist can.