Yes, progressive enhancement is a fucking moral argument

The way I see it it's properly insuring that the site can be used in ways that the programmer might not predict even after it's grown to billions of lines of code and/or has been abandoned. (See http://www.warnerbros.com/archive/spacejam/movie/jam.htm)

Imagine if eBay, IMDB, and millions of other cruddy old site's were designed in a manner that didn't depend on screensize, pointer or input method.

Maybe they wouldn't need to make seperate ghetto mobile versions of their site that are still missing features. The site would just adjust itself according to its context.

This article is unfortunately not very well organized, but I agree with its sentiments.