To your #1, with the iPhone 12/Pro, why would theoretically include a power adapter when you sell it now that it is not included? Also, are you telling me that you have never bought alternative ways to charge your phone until now?
To your #2, you only have the lightning cables that are included with the iPhone and you literally travel everywhere with that one cable and sell that one cable with the device when you sell or hand it down? I know from previous experience with using ligthning cables since my iPhone 5, I've had cables in my cars until I switched to a Qi Mount/charger in my car. I've also had cables at both work and at home. I can plug my phone in by my couch if I need to, I have a Qi charger by the bed and also have a lightning cable there to charge my iPad.