Joel's post is really about levels of abstraction (well that, and being snarky.) At a high enough level of abstraction, what he's saying is precisely true (iamwill points this out in a more aesthetically pleasing way[1])
Some people complain: "Images are not text!" But at a high enough level of abstraction, images are text, but interpreted in a special way by special software that someone else wrote.
Some people complain: "Images are not text!" But at a high enough level of abstraction, images are text, but interpreted in a special way by special software that someone else wrote.
[1]: http://news.ycombinator.com/item?id=2867214