It’s not related, but I have seen some docks that offer multiple USB-C connectors as well as power pass-through. They’re rare and expensive. I expected to see multi-port USB-C hubs at least by now, but those haven’t appeared almost four years out from the introduction of USB-C on Apple and Google hardware.
However, USB 3.0 with a Type A connector can carry 5 Gbps, and a 3.0 hub connected with a Type-A to Type-C connector will likely perform just as well as an all USB-C connector. Very few devices perform at 10 Gbps or even close to that.
It’s also possible to get 10 Gbps USB Type A devices — the USB-C connector isn’t required for higher speeds. But I’m unclear if any company has built those out.