I myself speed through the lesser enemies because I find them boring. Its a waste of my time when I don't need the engram's. The gear that I have is already better than pretty much anything that will ever come out of a engram. I do the playlist for non specific strike bounties instead of running devils later because of the guaranteed blue that can become a mote of light. Other than that strikes are pointless and boring when the only thing I have left to gather is the rest of my raid gear.