I have BW excellence 8.6s.  These are one of the few edge rated half ropes.  Supposedly they are good for one sharp edge fall, but not two.  I am not sure if this is the single rope sharp edge test, or an additional double rope test.   
  
The important consideration is the fall factor.  A factor 1.78 fall is a hard fall (factor two is max).  I dont think most folks make a habit of taking falls anywhere near this hard on a regular basis.  A 20 footer 40 ft up a route is only a factor 0.5 fall by comparison.  Unlike the test, real ropes will likely have significant time between falls where the polymer molecules can relax to a less elongated state.  In practice ropes should take considerably more falls (even decent whippers) than the test suggests.   I would imagine the test is pretty conservative by design.