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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.
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.
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.