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I don't understand why people are so confused on this. Apple ships models that fill the lower price brands. It is the iPhone 7 and iPhone 8 which are still supported and being sold.
But I don't want an iPhone 7 or an 8. And it makes no sense that Apple sell both the 7 and the 8. Apple should make a phone like the SE which is made for the low-mid market, not just discount its old models.
With the solve down in new features and design Apple could have skipped the iPhone 8, XS and XR. Except of cause "the market" and their stockholders expects new phones, regardless of the need.