This photographer stopped using a Mark II in order to use his iPhone's camera because it was more convenient, and NOW he complains about the iPhone photos not looking good on the MacBook Pro with the Retina Display. What was he thinking when he started using the iPhone's camera?
He also said the photos he took with the Rebel XTi were orange and blurry. I used to have an XTi until it was stolen during a move. I wonder which lens he was using. It's true the photos on the Rebel look orange, but they were very sharp due to my using a 35mm prime lens with it.
The blogger is a software developer, who generally only views his images in instamatic and tumbler. So it is understandable that he may not always want to carry a whole big camera with him. His tak away from his experience is to get a "pancake" lens for his dslr so that he will have his best camera with him. I think our take away should be that if is a good idea to see your work in different formats (print)
The old adage "It's a poor workman who blames his tools" comes to mind. Of course, part of that is knowing the limits of a tool and using it appropriately. An phone camera may be great for capturing the moment, but you have to know what to expect from the technical quality when you use it.
Still, a lot of us may be surprised by when we first see our work on a Retina display - and not always in a good way. I wonder how some of my older photos from early "professional" digitals will hold up. The bar is rising.
Ignoring the content of the OP's article and focusing on "the camera you have with you"...
Over the last year and a half, I picked up both the X100 and X-Pro1 after focusing on DSLRs for the last 7 years or so. I instantly found myself with a camera while walking around, vs with a DSLR it often times getting left at home because of it's weight and size. I feel like I have so many more memories from the last two years compared to the previous, simply because I am shooting more and enjoying it more.
I suggest any shooter to get something portable, not as a replacement for your DSLR, but as a companion, so that they can have something of quality with them at all times to capture their life and various other moments.