USB is about to get more complicated in the next couple of years. Now that USB 3.1 Gen. 2 is almost four years old, a Californian company is ready to introduce the world to USB 3.2 and has even demonstrated how fast the new standard will be through video. If all goes well, USB 3.2 could provide similar transfer rates as Thunderbolt 2 or twice that of USB 3.1 Gen. 2.
https://www.notebookcheck.net/New-video-demonstrates-USB-3-2-with-transfer-rates-of-up-to-20-Gbps.305988.0.html
It was running at 1.6GByte/s, which is 12.8Gbps.
Even with a 20% overhead, USB3.2 should reach 16Gbps (2GByte/s).
They still need to work on it...
Meanwhile, the vast majority of notebooks is still stuck with USB 3.0...