Since the new Macs have only Thunderbolt 3 - you will need a adapter to connect the USB from a phone to the Mac for iTunes and other uses like charging, transfers etc. I would assume at some point the iPhone will no longer come with a lighting to USB cable but a lightning to Thunderbolt 3 (and the actual charger change also). I wonder when this will happen. Once again Apple is making all the cables and chargers etc. that you have junk. At some point they will just turn off users. At least, at the prices they charge, they could include a bunch of new cables with the equipment.