True, I'm sure there are a small number of first time iPhone buyers that don't have a USB-A to lightning cable. They are in the extreme minority though and probably less likely to be upset about this than the more vocal repeat buyers.That an interesting sentiment when it comes to those who don't any USB-C power adapters or USB-A to Lightning cables.
Apple also has a history of eliminating "standard" features (floppy drives, cd drives, audio jacks, USB-A ports, etc.) so I don't see how this is different. Apple is simply pushing the market like it ALWAYS has. In this case, I would say they are late to the game as just about every other Tier 1 brand has been using USB-C for a while.
Although I have dozens of USB-A to lightning cables and bricks, I had no USB-C brick. My wireless charger doesn't work with my new iPhone either. Progress isn't cheap.