The old example had two downsides: - It promoted a blocking UI design, where the user is shown a popup before actually executing the operator. - It didn't show how to actually use the property values. The new code avoids these mistakes. The properties are also shown in the redo panel in the 3D view. Note that I also changed the bl_idname, as this is an example about properties, not about dialogue boxes, and changed the class name to use the standard operator naming convention. I also extended the example to include a panel that sets multiple properties of the operator, since I see questions about this relatively frequently.