Usually when the layout breaks, functionality is lost: buttons can't be clicked on, text can't be read, content is obscured to the right, etc. If none of these things are happening, I'd agree not clipping is fine.
Do you have any data to back up that "usually"? IME more often than not the only reason why content is clipped is because of looks not because of functionality. This also applies to the example in the article.
The HTML default is to flow elements to make space for larger conent. You need to go out of your way to break that.
