If I select ARMv7 instead of FAT (ARMv7+x86) in the Android Build Settings of Unity5-Free, the APK binary drops to half size.

FAT => ~20MB
ARM => ~10MB

(Tested with an empty scene, no assets, nothing, just the core libraries).

**Questions:**

1. What is the drawback of compiling only for ARM? Any "official" stats on how many business do I drop if I kill the x86 users?
1. Is there any way to publish a binary to the ARM users and another version to the x86 users but with the same product-id so if they change the mobile phone, the software gets properly downloaded?

Thanks!