Oh my. Yeah. Your app working only on 1/4 of the devices in place of 100% is not compelling. What a waste of time.

First you said a mobile app developer doesn't have to worry about various screen sizes. But Android devices come in a ton of sizes and form factors. iPad apps are windowed and resizable, and a native Mac app runs on a system that connects to a monitor of arbitrary size.

So give that point was completely bunk, you changed it to something about the total number of internet connected devices. I have absolutely no clue why that is relevant, and you haven't explained why it is either.