"The AirPower charger is also more advanced than the current competition because it includes a custom Apple chip running a stripped down version of the iOS mobile operating system to conduct on-device power management and pairing with devices. Apple engineers have also been working to squash bugs related to the on-board firmware, according to the people familiar. They asked not to be identified discussing a product that hasn’t been released yet.Why Apple’s AirPower Wireless Charger Is Taking So Long to Make -- Bloomberg
Apple designers eventually hope to remove most of the external ports and buttons on the iPhone, including the charger, according to people familiar with the company’s work. During the development of the iPhone X, Apple weighed removing the wired charging system entirely. That wasn’t feasible at the time because wireless charging was still slower than traditional methods. Including a wireless charger with new iPhones would also significantly raise the price of the phones."