Don't think it's exploiting to farm. Destiny has always been about allowing people to play the game how they want and not to be forced into any one mode. Personally I do kind of shake my head when I read all kinds of threads obsessing about farming routes. To me these are probably the same people complaining about how the game is so repetitive and not fun. I just don't get this generation of gamers. I feel like people rush through as fast as they can, find out the fastest way to get the highest level and best gear, but at the expense of fun. I actually read someone saying if they weren't high enough to do the raid the day it launched they may quit. Blew my mind. I have all the time in the world to do that. Probably won't attempt for another month at least. Personally I find the 'most efficient' means are often the least fun and the game becomes more of a job or chore. After I hit 20 I will still likely just run missions or strikes and whatever I get, I get. Spend too much time worrying about not getting certain items and it will kill the game for me. I would say it's ok to mix in a bit of that, but not all the time.