im not saying engineering is the ONLY hard major there is...lawyer, doctor, basically everything has a moderate amount of work involved with some exceptions...im just saying why would someone take like advanced math classes in a history major...yea they mite take some real basic math class but not something advanced...
Reasons why someone in a history major would take physics w/ calc instead of physics without calc:
1. You will quickly learn that working with a group of people is what college tries to instill because in the work world, you may or may not work in a team setting. So in the scenerio, you know a bunch of people who take physics w/ calc and your major doesn't require that from you, then you may want to take it with your friends so as you can study together, take online quizzes together, or even do the homework together.
2. The person in the history major may not be set on sticking with that major and can forsee that a change in major is coming (as students change majors 3-4x fold so the legend says). The major lets say they will change to is engineering; it would be easier on the student as far as transferring credits and classes taken if they have taken the physics w/ calc instead of the the physics without or the calc suite (calc 1-3 and differential equations) instead of just business calc or even pre-calc instead of trigonometry. Some colleges (ex College of Engineering, College of Liberal Arts and Sciences, etc. and not the college/university itself) do try to make the transition easy and will see what classes you have taken and somehow try to transfer them for the equivalency of the classes as required by them but ultimately will make you take some of the core classes (chemisty, orgo if your doing chem or materials. eng., calc, physics w/ calc, and etc) that are required for the major before you even get a chance to take the courses related to your major like microprocessors or circuits for computer and electrical eng. to thermodynamics for mechanic eng. And the probably worst part of it all, is it will just push your graduation date back further and further, it's almost like basically starting all over after 2-3 years of college. So with all that information dropped on you by the advisor you either can say f it, i'll just stick it out in history and see what comes up or you can take those core classes then major specific courses.
There could be lots of odd scenerios as to why a student would take a more challenging class than a general one for ones major but it all really ties into what is needed for your course track (universal tracking as they call it at some universities) is for your major is what will let you know what classes you need to take.
Ultimately, you can say f what everyone says but after your first or second year, you will understand the way things go down.