to answer both of the post above and playing a bit of devil's advocate:
Its about the Eco System, the way i see iot devices being implemented in the future is that an individual's preference of which app "ecosystem" they prefer. will it be google, apple or windows. these three are the major players right now. Suppose you are a non-tech layman and someone provides you with three choices, Apple (you have heard about it and possibly use it), Google Android (you have heard about it and possibly use it) and Raspbian (What the heck is that?).
Secondary app, development ecosystem, Apple (you have heard about it and possibly your developers already work on it), Google Android (you have heard about it and possibly your developers already work on it) and Raspbian (you need to train people to use it)
So, for OSes by such big companies, we need to think from a "non-maker" perspective. I do reckon that you and I can make really great IoT projects using this, because we have an inclination toward doing a lot of things manually.
But believe me, hundreds of thousands of android app developers who have been working in a cubical creating apps for MNCs, they can't do it using raspbian, but suddenly we have a form of android running on this and now they can because for them it's just a matter of adding a few extra lines of code.
My apologies for shameless YouTube Plugs...