We’ve seen the first example circuit in the first ... the onboard USB 3.0 hub of the Pocket Reform board has four free ports, but there’s only two USB-C ports you can expose USB 3.0 on.
Few people have a full range of USB-C or Thunderbolt gear, so you’ll likely need a USB-C hub to add different ports—such as old-school USB-A—to your Mac. In general, an “adapter” works ...