The isasue is that most of Android's native code is still biased toward ARM, and Google has no plans on changing that any time soon (despite a separate deal with Intel for Android tablet chips and SoCs). The issue (with all Android emulators) is that the better ones also require emulating ARM (that includes DuOS from the BIOS geniuses American Megatrends) - this is *despite* Android back to ICS being available to x86.
