While Android might be internally consistant, the hardware drivers that support it isn't. Everywhere your software interacts with the hardware is suspect for f

While Android might be internally consistant, the hardware drivers that support it isn't. Everywhere your software interacts with the hardware is suspect for fragmentation. Google will have compliance testing to force OEM's into correctly supporting the Android runtime. However, their only leverage is the inclusion or not of their Google Apps and the "Made with Google" logo for the back of the device.