The OS and API surface is the same. Why did you comment without even checking what the article is about? What's the point except the useless ignorant snark?
Because it's valid snark and at this point an on-going joke. Fragmentation seems to be very much part of the Google culture.
Serious question: what's the difference between fragmentation, and really extended A-B testing in different market spaces?
As far as I can tell, the OS is the same, but the Google apps are different.