USB-C is a port. Thunderbolt is a protocol.There simply might not be enough bandwidth left after accounting for the 6K video stream to justify anything faster than USB-C. TB3 has a number of extra capabilities over USB-C, among them are more bandwidth and daisy-chaining. The former might be moot after subtracting the 6k video stream and the latter is at least partly compensated by there being three USB-C ports.
Yes, marketing material gets this wrong too, but whatever. The USB Type-C port is the third type of USB port after USB Type-A and USB Type-B (in its various forms). USB Type-C is the first type to support more than just the USB protocol (versions including 1.0, 1.1, 2.0, 3.0, 3.1, 3.2, 4), including DisplayPort, HDMI, MHL, VirtualLink, and also Thunderbolt (although USB Type-C is guaranteed to support the USB protocol, the other protocols are optional. Power-only USB Type-C cables are defined in the standard, but I've never actually seen one, and I doubt anyone would bother manufacturing one).
Sorry, this is a pet peeve of mine. Understand that USB Type-C has no speed. It is not a protocol.
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