I think what a lot of people don't get is the following:
Apple is reusing ideas that were seen on Android already, yes. However, 2-3 years ago when these ideas were introduced, Android did a ****** job at putting it together. They did a ****** job at maintaining it, and they made ****** OS that ran it. iOS is way more capable of actually putting these things to use than Android is. Do I see lag on my 5S? No. Do I see lag on S4's and S5's? Yes.
My .2
Apple is reusing ideas that were seen on Android already, yes. However, 2-3 years ago when these ideas were introduced, Android did a ****** job at putting it together. They did a ****** job at maintaining it, and they made ****** OS that ran it. iOS is way more capable of actually putting these things to use than Android is. Do I see lag on my 5S? No. Do I see lag on S4's and S5's? Yes.
My .2