To sell wireless headphones for $100+, higher revenue per person, and provide a non dorky way to listen to stuff through your smartwatch. All of them have wireless earbuds and smart watches. You need to replace them when the non removable battery dies so it's really a wireless headphone subscription. Apple's practice for the watch were the two final iPod nanos. Attaching it to your wrist with a headphone cord running up your arm looked dorky. Apple doesn't do dorky, Android OEMs didn't want smartwatches with headphone jacks to look dorky either. And Android OEMs often copy Apple because Apple is the more stylish one