* Buy adapter. * Buy extension cord. * Buy USB-C cable.
Those aren't packaged together anymore so now you get 3 separate boxes full of packaging just for a power adaptor. It feels wasteful... not to mention annoying if the apple sales person forgets to tell you you need to buy USB-C separately! And the correct one at that.
An iPhone 7 buyer is far more likely to find a USB-A port to plug into. Your idea would be to make the masses buy a dongle, instead of the minority who own brand new laptops.
The AirPort has never come with an Ethernet cable
The iPod never shipped with both FireWire and USB to 30 pin cables
The ThunderBolt Display was incompatible with Macs without ThunderBolt ports
The 30" Cinema display was only compatible with the Mac Pro when it launched and later required adapters (not included) to be used on other Macs
The original iPhone's recessed headphone jack required an adapter to use older iPod headphones
The first generation of Apple USB mice/keyboards did not come with an ADB adapter