Dropping lightning in favor of usb-c means instantly deprecating millions of accessories, so it's not the free change people seem to think it is. Remember how much noise people made when the 30 pin connector was dropped for lightning - a cable that was better in every possible way? and there were far far fewer iPhone (and smart phone in general) users back then.

I feel you in the annoyance of periodically only have usb-c cable with a low battery phone, but I also have quite a few other accessories that I'd rather not have to replace (I've had a decade to accumulate such, and a lot of that time predated usb-c)