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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.
Pretty sure this person is just talking out of their ass. I found one source from four years ago that showed a price difference of about a buck to manufacture. Yes, that is more expensive, but passing that dollar onto the consumer for some USB-C ports on a motherboard seems pretty reasonable, and by now I'm sure that gap has decreased significantly.
Some of the implementations are pretty expensive, usually the ones found on phones that need to do everything. But they brought the price down with a myriad of different feature supports so you can progressively wind down costs, but with it, features. Not all USB-C ports are made equal. Some ports have the bandwidth but not the power feed, others can be made specially for charging with 48W+ feed, some are stuck at USB 2.0 specs.