There is the caveat that it's hard to get things done in a timely manner on phones, or even tablets/phablets. If I need to crank out a lengthy blogpost, then I need a full desktop environment where I can do cross referencing, wikipedia lookups, file selection, photo editing, and all the other things that a desktop affords. I have tried writing a blogpost on an iPad and it took up my whole day when it should have taken 2-3 hours.
I know people who have developed super-fast methods for working on iOS but they are such a rare creature, and I'm not so sure their workflow is even teachable enough to be widely adopted by journalists or professional bloggers. From my experience they're relying on all sorts of hacks to get a blogpost out the door like using some perfectly curated mix of apps, and being able to pass files to and fro different apps with ease. Hardly the stuff of laypeople.