Myth, or unrealistic expectations? Aside from the point that one should make sure a significant number of their website visitors are from tablet / mobile (which based on broad trends, would be surprising to find wasn't the case) before diving into targeting different than desktop screen resolutions, I would have liked to see more detailed analysis on the alternatives and whether they were any better. My sense is that responsive design is a technique that can make managing desktop / tablet/ mobile experiences easier than maintaining completely separate websites. Another point of doing responsive design is that a few tweaks can make one experience (say tablet landscape -> HD) work much better for a range of resolution sizes than doing a fixed pixel design.