Difference is iOS updates are required to be able to run apps whereas it's optional on Android. For example, I couldn't run Hangouts on iOS 7.0.4 so had to upgrade to 9.2.1 but it rendered my iPhone 4S useless and there's no way to go back. My Note II from the same era running Kit Kat 4.4 can run the latest Hangouts, has 2GB DRAM that iPhone 6S and 6S Plus got in 2015, has better foreground and background multitasking/PiP in 2012 than iOS 9 in 2016, can navigate the OS with pen in place of finger compared to iOS 9 that's still trying to figure it out, etc. iOS requires more frequent updates since it's about 4 years behind.
Your note 2 is vulnerable to stage fright and should really not use MMS though(at the very least not auto retrieve MMS) There are also plenty of Android apps that require lollipop. You have a point but it isn't that rosey!
Also it may have 2gb ram but you know touchwiz is making it perform similar to a 1gb ram ios device WRT the system resources actually available for apps to use. (Or similar to a stock Android 1gb device even)
Beside the point completely but there are tools/methods available to downgrade the 4s these days fwiw
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