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A new smartphone again? Rethink unhealthy culture of frequent upgrades
(www.straitstimes.com)
This is a most excellent place for technology news and articles.
I'm not sure why you're getting downvoted because your argument is right. Apple has a rather small number of hardware devices to support. That makes long term support a lot easier.
Edit: I mostly disagree with your previous argument though. Planned obsolescence is alive and thriving. I've seen so many PCB layouts where heat sensitive parts were placed right next to heat emitting ones that I cannot believe this is by accident.