Re: I find this funny
There is actually a huge number of device sizes, because you have iPads in three sizes with split screen. The total is around 25 sizes. Any reasonable developer writes code that runs on all device sizes.
SDK 11 support will be needed as soon as there is any other device with a notch. With iOS 10 you can't find out if the device has a notch and how big it is. You can check that the screen size is that of an iPhone X and assume that every iPhone X sized phone has an iPhone X sized notch, but that will obviously break when the iPhone X+ is released.