The general view of the W3C as a standards body is broken.

The W3C gets companies and individuals together to hash out ideas for the Web. After some time and trial and error they assemble a recommendation. Hopefully people (i.e. the members of the W3C) put this into practice to see how well it flies in real-life. At some point, if the recommendation proves its worth, a standards body such as ISO or ANSI may want to formalize it. Or so it was.

Once upon a time yo could find on the W3C site a statement to the effect that they were not a standards body. However, some people who wanted to see the ideas from the W3C gain more traction (i.e. XHTML) started referring to W3C docs as standards, and the W3C as a standards body. Jeffrey Zeldman, in Designing with Web Standards [sic], says the use of the word "standards" when referring to these specs was, in fact, "a guerilla marketing maneuver."

This is not mere semantics. There is great value in making a distinction between well-considered ideas that still need to be battle-proven, and proper formal specs that have been sufficiently vetted.

Eventually the W3C began to believe the hype and now presents itself as a standards body, to the detriment of the greater Web community because, as you point out, they are "standardizing" things that people aren't actually doing.