Don't listen to me—I don't know anything about good API design. (That's not sarcasm or modesty, but the simple truth.) However, if the self-diagnosed biggest mistake of Tim Berners-Lee's life was to add a single extra character to a commonly typed string, then surely one has to consider that the addition of two extra characters could eventually also be judged a mistake?
From my point of view, he wasn't saying it because it's an extra character, but because http://news.ycombinator.com is more cryptic and harder to understand than http:news.ycombinator.com.
That fits into my belief that more readable (move instead of mv) is better.
