So what do you mean by fragmentation? I take fragmentation to mean people not getting immediate updates from Google, not having the latest operating system and its features, and therefore making things harder to develop for developers.
As long as devices do receive the updates, I can understand not getting immediate updates. I mean, if Google has release date X, it is understandable for OEMs to have release date Y, as long as Y is not never!
Oh look, Siri features for Google now like location based reminders
EDIT: Have to say though, looks cool.
Even if there is overlap in Google products and Apple products, it is nice to see missing features get added and optimized, and it goes both ways!