Many of us - specifically perhaps photographers - wish to use our images not as graphical enhancement to our message, but as our message. This means we would like to feature the entire image, not have it cropped. There are ways to feature the entire image, but not in all presentation options. We can have entire width, or inline, but the ability to size the image, to our liking, makes the webpages we create in Spark more valuable as a tool to present our creative work. Same for graphic designers or illustrators, who might very well seek a sizing option that they can choose.