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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.
A cheap USB hub solves everything you are describing. You can just leave it dangling from behind.
Saying that, I'm not in favour of only usb-c motherboard though.
Cheap USB hubs get fried if you try to use it with something that requires power feed. Or usually just feed the whole voltage to one of the connectors, have fun finding out which one. Fully competent dock hubs are not cheap.