You are right, the iPhone 6s has all that: better colour accuracy in pics and screen, better ecosystem, better single core performance .... So why is the iPhone X so much more expensive than the iPhone 6s? The only new things in the iPhone X are stuff that android phones had years ago (OLED screen, bezel less design, induction charging, fast charging out of the box) and didn't cost extra.
How do you defend the price increase?
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The iPhone 8 has iOS on it too, so why is the iPhone X so much more expensive?