They design for the devices they have. They also design for the largest part of the viewing traffic of the web (ios). Apple is still a design deity.
Apple had the first big app platform and clients still demand iOS first. In game and app development, it still gets the most focus.
Finally, and a bit of a trick almost, is the review times are longer for Apple when talking about apps, this causes a focus on iOS earlier many times. Projects tend towards getting iOS ready early and in the queue and approved and the Android platforms second because Google Play is instant almost (Amazon is as slow as Apple on reviews). Like complaining customers that get the most focus, the more difficult to approve platform gets the most focus but only because of its market share and past (new entrants need to be easier).
However with Google's beta system on Play more and more projects are starting there now that a good chunk of clients have Android devices. Apple really needed to buy testflight because they didn't have anything as nice. Android is becoming a better test market and something you can iterate on faster early to prepare it for iOS, lots of game developers are thinking this way now, primarily because iOS is so hit driven at launch you have to get right and Google is better long tail is seems.
Apple had the first big app platform and clients still demand iOS first. In game and app development, it still gets the most focus.
Finally, and a bit of a trick almost, is the review times are longer for Apple when talking about apps, this causes a focus on iOS earlier many times. Projects tend towards getting iOS ready early and in the queue and approved and the Android platforms second because Google Play is instant almost (Amazon is as slow as Apple on reviews). Like complaining customers that get the most focus, the more difficult to approve platform gets the most focus but only because of its market share and past (new entrants need to be easier).
However with Google's beta system on Play more and more projects are starting there now that a good chunk of clients have Android devices. Apple really needed to buy testflight because they didn't have anything as nice. Android is becoming a better test market and something you can iterate on faster early to prepare it for iOS, lots of game developers are thinking this way now, primarily because iOS is so hit driven at launch you have to get right and Google is better long tail is seems.