You do not present an hypothesis; it’s an assertion. An hypothesis claims a variation in one value causes a variation in another via an implied direct relationship: “If X increases, then Y increases” (there are several variations on this, of course). Your assertion that iOS makes you more productive relies on an assumption (A1) and three implicitly supported, though here unsubstantiated, hypotheses (H1, H2, and H3):

A1. A mobile OS is less capable than a “traditional” OS.
H1. Greater (less) OS capability increases (decreases) the opportunity for distraction.
H2. Greater opportunities for distraction decrease focus.
H3. As focus increases, productivity increases.
Each of these—including A1—deserves its own thorough discussion.

All that said, I find merit in this line of thinking. I don’t accept your pseudo-scientific approach implied by calling your assertion an hypothesis, but I don’t necessarily disagree with your assertion.