Why don't you like balance in a game?
It's not about liking it, it's about whether it's important. If you disapprove of something that, in your view, harms the balance of the gameplay, I'm sure you have the self-control to refrain from using it.
In the multiplayer mode, yes, it's important. Your experience is directly affecting, and affected by, the experience of others. Whether competitive or cooperative, it wouldn't do for a given player to have an unfair advantage due to items, mechanics, or whathaveyou.
But in a single player game, it does not matter. My experience with the single player game does not affect your experience with the single player game. I know I speak for a lot of players when I say that after a certain point, I'm playing the game largely to experience different outcomes. Using cheats or glitches might improve my experience - removing the dupe for example, harmed my experience on subsequent playthroughs. Maybe it's not balanced, but who cares? I'm not playing for achievements or e-peening, and I don't want to have to personally gather every last elfroot required by the continent spanning organization that I lead.
Anyone who wants to abstain from using these items or these glitches is welcome to do so.