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Frankly, I'd point to where you say so yourself:

> Not every new interface will work equally well on old hardware, but that doesn't mean that the interface has deteriorated.

Apple is well-known for long support periods on mobile, and 5 years is not, in my eyes, an old computer that ought to be replaced. And so if the interface doesn't work as well on the authors supported hardware, then I think we can agree the interface has objectively deteriorated.