Not trying to be pedantic, but the thread "seemingly" in some peoples minds(thought not all), have gone from a malicious conspiracy to defraud you of your money, to plain old obsolescence. I'm going to take it further and say some IOS updates may impact some users in a fashion they deem negative. There clearly isn't one size fits all with respect to the way apple customers view their phones.
I never talked about any conspiracy. Not once. All I said is, I don't know if Apple is deliberately slowing devices with iOS updates (I.e, purposefully writing code to slow it down. That's not even my main hypothesis). As I said, my main hypothesis is that Apple doesn't do enough to optimize updates for older devices. And if updated far enough, the device will NOT work well, in every single case, when compared to the same device on an older version of iOS. That's all I've said. I never jumped from any malicious conspiracy to old obsolescence.
You will deny this as anecdotal, but I will say it anyway: yesterday, a friend had an iPhone 6 on iOS 11.3.1. He isn't tech-savvy at all. Talking about iPhones, he said, this phone is too slow, it doesn't work very well.
In every single case of complaint I see, there is a common denominator: It is always an older phone, updated to the latest version. Always. I saw another iPhone 6, this one on iOS 9. Really fast. Of course, the user has no complaints. I am seeing a common denominator. I check a lot of phones (yes, deny this as anecdotal, I have no proof, I have been over that. Perhaps someone should compare thousands of non-updated phones to their updated counterparts and check response times. That would be useful).
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At best, Apple can be accused of using a different criteria for what is usable.
Planned obsolescence is using components that you know will fail within a short lifespan. I can argue that given the security landscape, Android manufacturers only updating for 2 years is planned obsolescence.
I can't believe Apple deems - assuming what you're saying is right - some cases useful. (That iPhone 6 I mentioned on my reply to i7Guy, I wouldn't use it as my main device for more than 10 minutes, it's unbearable, in my opinion).
But yes, you might be right. Apple might think that people will understand that as it is older they have no "right" to an acceptable performance anymore. I disagree, but you do have a point.