It surprises me that some people still say that smartphones and tablets are only good for content consumption, and not content creation.
That is only true if you totally ignore all the status updates on Twitter, Facebook, Instagram, etc. and declare that content on these social networks is too trivial and unimportant to be considered content.
One has to understand that the meaning of “content” has changed a lot with the development of technology. The content that was inscribed on the walls of the pyramids, for example, is very different from the random BuzzFeed article about Justin Beiber. Similarly, the content in the mobile age will be very different from the long-form blog-ish content of the Web 2.0 era. It will be more short form, more photos, and more multimedia. And for this type of content, smartphones generally trump PCs as content creation devices.
This will also be true of smartwatches. Whether or not smartwatches will become content creation devices depends not so much on whether they are good for writing long emails or blogs, but more on how communication forms evolve. And we can make a sure bet that the communication forms will evolve towards the most popular devices, hence if smartwatches become popular, then content will evolve to be better suited for these, which means shorter and more textual or emoji. With the huge strides being made in speech recognition, it is very likely that smartwatches will easily gain the capability to create these kinds of content.
What is important is that one has to recognise that both sides of the coin will evolve in concert. Saying that smartphones and tablets are not good for content creation basically shows how outdated your view of content is.