[willis936]

What's annoying about this particular issue is that the problem that users don't like isn't Apple's battery saving measure, or even being lied to, it's phone performance slowing over time. That is what users care about. The battery peak load degrading over time is a factor, but even with battery replacements phones will feel more sluggish over time because the NAND is a disposable part. Fill up a higher percentage of your total storage? Feels slow. Take videos for a year? Feels slow. There is no reasonable oil change for this and it's something that is not being talked about anywhere.

[zepto]

Is there any reference at all for this?

My iPhone X is 3 years old, and feels just as fast as when it was new.

[willis936]

Reference for what, exactly? There are no references that highlight the issue of storage performance in iPhones. I haven’t even found a review that looks at storage performance of iPhones in the past three generations. Brand new performance, not even performance over write cycle. That is the issue I’m raising.

If you want a reference that proves that NAND performance degrades over write cycles: then I will only list one, but there are hundreds, at least.

https://doi.org/10.1109/RELPHY.2008.4558857

[zepto]

Sure - entropy.

But is there any evidence that translates into an appreciable impact on device performance?

Perhaps it doesn’t, and this is why nobody is talking about it.