That page’s examples are mostly a bunch of paragraphs of prose (that part, TeX is great at), some with fancy formatting that took significantly more effort than the equivalent effect in InDesign or QuarkXPress. The one with the Zapfino doesn’t bother using any alternate glyphs (arguably the main reason to ever use Zapfino). A few others are vector graphics projects that would be best done in Illustrator, Inkscape, or similar. As you go down the list, the examples (like the thing with the hearts) start to be examples of tacky overwrought things slapped together by amateurs.
Obviously TeX is an extremely flexible system, and it’s possible (fun even!) to use it for all kinds of purposes it wasn’t designed for. Analogously, it would also be possible to write a web application in assembly code running on an Arduino. I said it wasn’t a very effective or productive tool for the job, not that it wasn’t possible.
What I meant to say was that in the hands of the right person, it would be effective and productive, but since you're not particularly convinced by anything on that page, I think I'll have to concede this point. You win :)
Obviously TeX is an extremely flexible system, and it’s possible (fun even!) to use it for all kinds of purposes it wasn’t designed for. Analogously, it would also be possible to write a web application in assembly code running on an Arduino. I said it wasn’t a very effective or productive tool for the job, not that it wasn’t possible.