You really don't know what you are talking about, Android is only originally built around the Nexus device Google is launching with the particular version of the OS, it is a huge effort to make compatible drivers for all the different pieces of tech that goes in to the different Android devices. Hence why it took so long for the Nexus S to get Android 4.0 Ice Cream Sandwich, not to mention the plethora of other devices still waiting on a port.