Doubling the pixels is really only useful if you plan on editing.
Thanks for the feedback guys, I'm glad people are still getting use out of this guide despite it being old now. I've been meaning to update it this summer since I've learned so much more about photography now and are going professional. However, it also means that I'm being swamped with photo work and haven't had time yet. But! Updating it is still on my list of things to do. These updates would include...
More on composition, better detail and explanation of a lot of present content (like tilting, focal length in relation to background, and more real-life photography tips. So stay tuned! When it's fully updated, it'll be marked as v3.0