Apple's brand is generally pro-consumer and pro-experience. How is such dated technology (i.e., USB 2.0) anywhere close to Apple's brand (read: market expectations)? If any other company said, "Here's a brand new 2023 $800 device with USB 2.0..." there would be blood in the social media streets.
There were plenty of other ways to differentiate the pro and non-pro models. Using USB 2.0 is lazy and shortsighted. Obviously, not on-brand either.