While this is generally true, it's a little more nuanced. For example: Android has a larger market share (by a lot globally), but apps are frequently developed for iOS first. Why? Because it's easier. Device fragmentation plays a large role in that, but part of the cost of the project is dealing with the development ecosystem (good or bad). As Apple makes the development less appealing (because of sub standard hardware / OSX) android will seem like a better option.