Like his example of TurboTax, it's a DIY alternative to hiring a professional. For example, my 80's band hired a graphic designer and professional print shop to produce a poster with a blank spot to hand write information for our latest gig. Today, I could easily create a unique poster for every gig and print it out myself. I'm confident the quality of the design would be better (the printing itself would probably be inferior, but good enough).
I think the point OP is trying to make is that just because you have Photoshop, that does not mean you have graphic design skill (and artistic skill it is not as simple as following directions on a tax form).
There's another point in there: just because you have a need for graphics doesn't mean you have a need for a graphics professional. Without Photoshop you needed a graphics professional for anything beyond a cardboard sign. Now you can do very well on your own, well beyond some definition of "good enough," before you need to pay a graphics professional.
