Sorry, you have obviously not used a PE in really tough conditions. A PE will do all those tasks, but not as long or as efficiently as an SE. A PE will crap out before a SE when cutting heavy straps and ropes impregnated with dirt, oil and grease. A PE will crap out sooner when cutting heavy plastic wrap and banding. A PE will crap out sooner when cutting heavy (1/2" thick or thicker) honeycombed cardboard. I have cut welding cables and magnetic crane cables with an SE easily. Even though the cables are thick, they are comprised of many small strands of copper. The PE blade stopped at half way through. Anything you can do with a plain edge can be done with an SE if you know how to use it. It will not be as clean and neat, but it will do it. They are also very easy to sharpen with a little practice. I have used PE blades in many great steels, but in the long run they do not out cut SE blades in good to premium steels. The only task I would not consider using an SE for would be cutting competitions or woodworking.