How does the optimizer model Sorrowbane's special ability?

The item level 180 weapon Sorrowbane has a special ability that only procs on “lesser” creatures. Do we know exactly how this works? How does the optimizer model it? Is this weapon better or worse than a typical mythic zero drop weapon at level 184? Is it better for dungeons vs. raids, where killing trash quickly is more relevant?

Right now we aren’t modeling the special effect on that item, so the optimizer is scoring it just for its stats.

Once we get some more info about how useful (or not) the proc is, we might adjust it.