This is just another example of Apple nickel-and-diming the most basic of features in an attempt to get the upsell.
I honestly suspect it’s a case of “Apple knows 99.9% of customers buying the non-pro phone don’t care about transfer speeds (which they know because of analytics)” and so saving $1 will add up over ~100m phones.
I seriously doubt any significant number of people were upsold on the phone because of transfer speeds. I honestly suspect 90% of people using the Pro phone don’t transfer data via a cable.