Agreed. This article is stupid because it extrapolates from a few cases he's seen personally (and it was his coworkers messing up; I'm sure he's such a good developer that he's never made a mistake attributable to the command line tool, like making a typo).

And as long as we're being totally unscientific about the whole thing, the most common mistake I've seen when using a version control system has come from people checking in unintentional modifications using the command line tool because it is easy to miss. In a GUI, you can better see what is being committed, and a simple checkbox lets you skip it, while double clicking gives you a diff that makes it so much easier to review every change before you commmit.