There's definitely overuse of the "destroyed", "unusable", etc. type of unnecessary absolute and extreme hyperbole, on top of mislabeling of many things as "proof" or "fact".
Certainly we all have different tolerances for what we consider acceptable performance.
I see
absolutely zero need to have to wait for any computing device to do simple tasks in 2018. There shouldn't be a single task that can be done quicker on an older iPhone running the iOS of its time. This is my personal view as nothing is more frustrating using a device than when it either ignores input or you have to wait needlessly for it.
When my 4S was on iOS 9, it couldn't even input letters with the keyboard without lagging out and causing a mess, or input the 4-digit pin without missing numbers. Skipping tracks in Music took 3-5 seconds. Fortunately, a jailbreak let me get back to iOS 6 where it did most things faster than my iPhone 6 does on iOS 10.
My iPhone 8 is acceptably quick in most regards on iOS 11, but we'll see how iOS 12 does on it.
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Sped is measurable. Performance based on speed is subjective.
You seem to think that people are claiming that Apple is slowing the
hardware down, but I don't see anyone making that argument at all (except for the obvious case when they did with throttlegate).
What we're saying is that the software (namely iOS) is bogging down the hardware to the point where it runs poorly -- ie. takes longer for the OS to respond/register inputs, load/change apps, change tracks, etc.
Throttlegate is the one exception where it is clear that Apple did indeed secretly slow the hardware down based on "battery health" (even while the battery was above the 80% threshold where they consider the battery to be "Healthy" and would not replace, even by request). Of course, since people are used to iOS updates causing their devices to perform more slowly, it didn't seem abnormal.
Phones running slowly is arguably one of the most compelling reasons why people upgrade their otherwise good phones. It was the only reason I replaced my iPhone 6 with the 8 -- I couldn't stand the input-blocking delays any longer.