title: For an iPhone only, iOS 7+ app, can we include only @3x images?
body: <p>In an effort to reduce bundle size, is it possible (and a good idea) to only add @3x images? </p>
  
  <p>To clarify, I'm not referring to the app icon, launch image, etc. But images that are internal to the app, like UIButton background images.</p>
  
  <p>I saw <a href="https://stackoverflow.com/questions/25781422/image-resolution-for-new-iphone-6-and-6-3x-support-added">Image resolution for new iPhone 6 and 6+, @3x support added?</a>, but it didn't answer my question.</p>