USB used to be easy to follow, but has become confusing since the advent of USB 4, USB C, and Thunderbolt.
System Information on my MBP says "Thunderbolt/USB 4" in its sidebar, but doesn't say anywhere that it'sThunderbolt 3. (Mactracker tells me that.)
And add to that the facts that
- A Thunderbolt port is the same as a USB C/4 port,
- Mactracker tells me that my Thunderbolt ports support USB 3.1 Gen 2, but as far as I can tell, USB 3.1 Gen 2 is really USB 3.2 Gen 1,
- and a USB drive plugged into a Thunderbolt port with an adaptor shows in System Information as utilizing a USB Bus but not a Thunderbolt Bus.
Truly confusing!