Earlier quoted context omitted.
The point is people don't want to carry a bag of dongles with them everyday. Especially the Pro model consumers. It's fine for reduced ports on an Air or MacBook, you're going to make sacrifices for portability. For a flagship laptop consumers expect options.
Meh, I have exactly the same problem with Nexus 6p. I need one USB-C/USB-A cable for data transfer, another USB-C/USB-C for fast charging from the power brick that came with the phone, but back again to USB-C/USB-A to charge from the car. And don't get me started about the lack of good car charges that that support USB 3.1 PD. It seem some friction to be inevitable when new physical connector is introduced.
I have a cable that never moves from my bedside, it plugs my Pixel C-to-C into the brick. I have C-to-A cables at my desk at work and at home, neither moves. Your car's C-to-A cable (presumably) doesn't leave your car.
The move to C on the host end is something that hasn't happened recently (not since A took off >10 years ago), but the move to C on the device-end is comparable to the move to the original 30-pin i-device cable, Mini/Micro-USB, or Lightning. It's obnoxious but inevitable.