I occasionally need to sort file listings, which typically have the file size in the middle of the line. The least bad way to do this that I’ve found so far is to copy the size to the beginning of the line, sort numerically, then remove the size, but a single command that combines the two existing ones seems like an obvious improvement.
(Yes, I’m aware
dir both support sorting by file size - I’m often working with listings from other people and telling them to go back sort the list is slower than just doing it myself. Also, I suspect there would be plenty of other uses for this feature.)