There simply isn't any need to do it - especially with the Ffenstri code allowing easy access to setting the position/size/etc of the window(s). All this can be in the image startup code instead of buried pointlessly in the file header. We could query the screen size(s), decide sensibly where to locate the window, whether it can match the saved size or not, all that in the image with easily modified policy.
Hear, hear.
-C