Android x86 works by default?

Hi all,

with the recent adding of x86 support for Android, I decided to buy an Android x86 tablet for testing (Dell Venue 7, specifically). I was surprised to find that my app can be downloaded from Google Play already and works without notable errors. The app is packaged with a captive runtime and I never made any changes to support x86 architectures. Is it not necessary to create an apk specifically for x86 devices? That is at least what I read in the Adobe guidelines.

Thanks