But, but "diluting the loot pool"! My e-peen is diminished if everyone has legendaries!
Is what I assume the mentality is. Otherwise I can't fathom why people are bothered over how other people who they don't play co-op with choose to play their game.
Now that said, while I have no problem with the Bee shield, I'm not a big fan of duping, because I kind of like seeing all the different variations that are possible for each legendary. At least, I don't see myself ever asking for a dupe. I certainly wouldn't begrudge anyone else their right to do it though.
How do these people who are complaining feel about games like Torchlight and Titan Quest btw, both of which are very open to modding, including drop rate mods? (the mod package loader is even an official part of the game, in the case of Torchlight)