Your analogy is incorrect because you are equating guides and walkthroughs to copied solutions. Copying solutions on a test is simple because there are no unknown variables. It is not the same with Destiny because there are many different variables such as different AI responses and the aptitude of a team. It is more similar to a study guide or lecture as it teaches you the general mechanics while still leaving the individual to work towards the end goal. Whether that end goal is beating a raid boss or a solution to an equation is besides the point.