[wang_li]

I can't even get updates for my original iPad any longer. It's stuck at 5.1 or something like that.

I installed iOS 7 on my iPhone 4 and the code is so unsuited for that device that many UI elements don't respond to touches and gestures made at normal human speed. You have to slow down by a factor of two or more for things to register. Trying to double-click the home button is an exercise in frustration.

It's definitely not FUD that apple releases OS upgrades that don't do well on older hardware.

[hendersoon]

That's absolutely true on mobile platforms, which have made major advances in both performance and architecture over the past couple of years.

It isn't true on PC hardware, where a modern kaby lake i5 performs similarly on desktop tasks to a a 5 year old ivy bridge i5. PC hardware has advanced tremendously in power efficiency, but much less so in performance.