The current beta of CarPlay can connect with Bluetooth. If the head unit is compatible (none are yet - you will need a new car). Phone calls work with Bluetooth, in fact I find that so annoying that I often leave Bluetooth off.
I thought the point of an iPhone is you don't have to carry a now redundant iPod. On top of that, using maps and streaming audio means your phone is using a good bit of power. Plugging in is easy so why not? Sure you have your reasons, but I'm happy I don't have to carry around a separate cell phone, camera, iPod, sound meter, compass, atlas, books, and so on. Hard to see why plugging a phone in in your car is harder than at home or work.
2018 Kia LX HEV Metal Stream with Advanced Tech