I think you are taking it the wrong way and you are not at fault, there is a lot of FUD about screen sizes.
Designing for flexible screen sizes and densities is pretty easy and I don't think I would gain any significant amount of time if Android was limited to 10 screen sizes.
You just think in term of dimension independant pixels & inflexion points where you adapt your design (one more row, multiple panes, etc)
Which really you're supposed to be doing on both OSs at this point. As an iPhone user there are still apps that don't support the 6 size screen and it's obnoxious.
iOS has four different retina screen resolutions on the phones, more on the tablets. For all we know there will be more in two weeks. Creating pixel perfect layout doesn't work very well anymore.
It may be easier to exhaustively test on iOS because there aren't quite as many variations, but devs should definitely be using flexible layouts.
And then of course there's accessibility. If your app is already designed to handle different screen sizes then it's easier to resize various elements because you want to bigger or smaller text.
I think you are taking it the wrong way and you are not at fault, there is a lot of FUD about screen sizes.
Designing for flexible screen sizes and densities is pretty easy and I don't think I would gain any significant amount of time if Android was limited to 10 screen sizes.
You just think in term of dimension independant pixels & inflexion points where you adapt your design (one more row, multiple panes, etc)