I have to disagree with this, all of your interaction is through a computer screen and the better it is the better the experience, my 13 inch rMBP is great but my favourite thing is how good text looks on a retina screen it's like reading top quality print. Most people don't need massive CPU power, huge amounts of RAM, or top level graphics but they all benefit from a great screen. They also seem to be much easier on the eyes when using a screen for any length of time.