Really, my only complaint about APC's is *WHY* do they have to be so sharp? If nothing else, the concensus is that the better wood props are at least as good overall in performance...and you can't cut up a steak with those. Obviously, sharp edges are not necessary.
You are absolutely correct, they don't need to be that sharp. On "slimers" you definitely need to need to dull the rear edge, or you will slice your fingers everytime you try to start your engine, unless you sand the trailing edge.. While I don't sand my "E" props, it does not hurt to do so.