Keep in mind that Fragments happened while Rubin was still nominally in control of Android. Once the civil war between him and Pichai had a clear winner (after

Keep in mind that Fragments happened while Rubin was still nominally in control of Android. Once the civil war between him and Pichai had a clear winner (after all, for a while both ChromeOS and Android were poised to push into the same market), the tablet elements were depreciated rapidly as as Duarte was free to assert more control.