You are fundamentally missing the point. Apple doesn’t expect iPhone X owners to upgrade to the XS.You cannot release a phone, the Xs, that really has zero meaningful advancements over the iPhone X...or this happens!
The camera is slightly better in the Xs, and it has Smart HDR and "Adjustable Depth of Field" which allows people with the Xs/Max to control the blur of the background in their Portrait Photos. I still believe that the iPhone X can do Apples version of "Adjustable Depth of Field" but they left it off the iPhone X so the Xs had one smaller "new" feature. I can do the adjustable depth of field with a third party app like Focos, which many say does it way better.
The A12 is a beast but it is nothing that you can really tell the difference in day to day apps and even with iOS 12. If they want to put these amazing chips (which are only going to get better and better) in the new iPhones, they need to have some sort of "Pro" apps that take advantage of that power or what good is it? We are all paying for something that we cannot even take 100% advantage of!
I could go on and on, but this is what Apple gets!
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The XS is a HUGE upgrade over the iPhone 7, for example. People upgrade every 2-3 years and with a 1B+ installed base of iPhones, there are always people looking to upgrade.
That’s how Apple sold 218M iPhones in FY2018.