Do you have any actual empirical evidence? In my undergrad, even different STEM departments (e.g., math, EE) had differing rigor and workload based on the avera

Do you have any actual empirical evidence? In my undergrad, even different STEM departments (e.g., math, EE) had differing rigor and workload based on the average scores they required of admissions. Almost all grading was done relative to other students anyway, so even with the exact same course, things would be very different. As an example, we had to prove all continuous functions on a closed interval are monotonically continuous on that interval, in Calculus I. Which we had in our first semester with no choice. I doubt this level of rigor is at all common.