I reckon that the question is, why should an 8.X user HAVE to download anything to return to the functionality of the previous version?
Why did MS decide that all computers needed the ‘smartphone’ interface in the first place?
Because they went overboard in wanting the same graphical look everywhere including the Microsoft websites/ That graphical look and interface is called Metro which is suitable for touch screen devices such as phones and tablets. Metro works well to condition and brainwash consumers except that it backfired by not providing that familiar start button for desktop and laptop users