Panos Panay opened up on why the Surface Pro 6 and Surface Laptop 2 lack a USB Type-C port while the Surface Studio 2, Surface Go, and even the Surface Headphones have one such port. Panay insisted that USB Type-C will not be at the expense of the traditional USB Type-A port, which still is the connector of choice for most USB devices today. The Type-C connector will eventually make it into future devices but Microsoft is in no hurry to make it happen.
https://www.notebookcheck.net/Panos-Panay-justifies-the-absence-of-USB-Type-C-on-the-new-Surface-devices.337032.0.html