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$300 Vision Pro developer strap is just an expensive USB2 device
(appleinsider.com)
This is a most excellent place for technology news and articles.
After the EU forced them to adopt USB C
It's not about USB C but about the USB version. Only their Pro models have USB 3 but the other ones have USB 2.
The reason they have USB2 is because they are using the same motherboard as previous models. They just soldered the USB-c port to where their lightning port used to be.
Meaning their lightning port was about as fast as USB2.
Not the same motherboard, but the same SoC.
USB 3 wasn't an option whilst they were sticking with lightning, and if the EU hadn't forced them they clearly wouldn't have switched.
The reason the new non-pro iPhones use USB 2 is because they still use the old chip which previously used lightning, and as such never had a reason to support USB 3.
So I would say this is about the connector, even though you're technically correct that the protocol is separate from the standard.