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My understanding is that Apple didn't add USB-C to iPhones because they planned to remove all ports from the iPhone entirely. They envisioned it as a wireless only device. EU regulation stopped this from happening, and now once they added USB-C it's difficult to take this feature away. I predict we'll be stuck with the USB-C port and form factor on most phones for the next decade.
This is completely illogical. There is no world that wireless charging or data transfer was going to be as good as wired. Was the iPhone all the sudden not going to work in the millions of cars that had wired CarPlay?
Wired CarPlay is not holding Apple back. I think they just figure it’d be harder for them to repair partially-bricked iPhones if they had no port to do DFU or whatever. That or they actually have done the market research and customers said they’d hold off on buying a portless iPhone because it’s a stupid idea.