You talking about during strikes? Because I hate to tell you but not everyone wants to sit and kill mobs for hours on end just in the hopes that legendaries drop. Some of us actually want to do the strike itself. Once I get to the Darkness zone area of the strike, I start killing the enemies not before (unless I have to). What is the problem with that. If you want to grind like that find friends who want to do the same and the three of you go grind on a strike map forever. I want to the objective of the strike. I have ZERO fun grinding on a strike. If I'm gonna grind I do patrol. It's that simple.