I think the issue concerns showing app data or what could be perceived as app data on an icon. If it's going to look like app data, it should be real data. It shouldn't be like the icon for iCal in OS X was for the longest time. Or like the Weather icon has been in iOS with the constant display of 73 degrees. Or perpetually stuck showing a time of 10:15.
6/16/13 at 9:31pm