Apple or any other company does not have to develope an all-day battery, they only do so to stay competitive as a selling/marketing features to set they products apart.
Apple will gladly sell you a hunchback battery case for your next iPhone to maximize profits, while making the excuse that battery technology is just not there yet for all-day usage. It’s not in Apples benefit to have users not to recharge their phones often as the battery will last that much longer, meaning people will use their iPhones for 2-4 years without requiring a battery replacement sooner, as the situation we presently live in.
Most apps, games, etc presently do not even harness the full potential of ARM chips since iPhone 6S/7. Most people don’t even use AR or other CPU intensive apps, mainly some games and social apps. What people need is better batteries in iPhones not faster CPU, I have never heard an iPhone customer complain of how slow their device is, I have heard that it does not last long enough or as long as it used to.
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Apple tax, charge an absurd amount. If you are referring to AirPower, its is overpriced to a point, however it introduces and possible expands/extends on the Qi standard.
AirPower should cost around $99-119 USD max, can you imagine the power adapter included with that things to charge 3 devices simultaneously. What if someone places 3 iPhones? That means the AirPower adapter would have to be 60W minimum from lightening to USB-C.