I can't see a single reason why iPhone shouldn't use usb-c at the moment except to build Apple's own walled garden to charge a surplus against its customer.
When USB-C is superior for using on phones, then I'm OK with it. But right now it's just exchanging one plug for another because a bunch of bureaucrats say so.
Does this mean in 20 years we'll still be stuck with USB-C instead of something better because just Brussels says so?