As Android adds more features, more of Android is implemented in Java. Pretty much all of Google Play Services is implemented in Java.
That means Android can rely less on the fact that graphics and the guts of many UI widgets are native code under a thin layer of Java. Android was always a "Java OS" but it has become more so since Android 3. So ART is important to keeping Android quick.
Still, your mileage may vary. Unless you are doing significant computation in your app, a synthetic benchmark will vastly over-emphasize the impact of a better JIT.
That means Android can rely less on the fact that graphics and the guts of many UI widgets are native code under a thin layer of Java. Android was always a "Java OS" but it has become more so since Android 3. So ART is important to keeping Android quick.
Still, your mileage may vary. Unless you are doing significant computation in your app, a synthetic benchmark will vastly over-emphasize the impact of a better JIT.