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Sorry, I'd rather have this integrated into the 3000$ dollar device. Maybe they can make it 2mm thicker without increasing weight - oh and then also, maybe we get the key travel back.

You mean the same way that everybody switched to DisplayPort and dumped HDMI? Wait, no, that didn't happen. Every mac user needs to carry around another dongle instead to convert.

I'm completely out of the loop here. Why would peripheral makers choose USB-C over USB 3?

USB-C and USB-3 aren't mutually exclusive. One describes the shape (Type-A, Type-C) of the connector. The other describes the speeds supported by the port (USB2, USB3, USB3.1).

Bidirectional power, reversible cables, ability to add extra modes (eg. Thunderbolt 3) to the same port with USB 3 fallback.