The good news is that it's possible to use Xbox controllers with the Nintendo Switch. The bad news is that it's not as simple ...
The uPD720150 USB 2.0 host and peripheral controller integrates communications functions that have required separate USB host and peripheral controller chips and features advanced power management ...
Blue: Supporting USB 3.0 SuperSpeed technology and above, blue ports identify a device capable of fast data transfer: up to 5 Gbps (that's 5,000 Mbps) -- a significant jump from previous generations.