For a year or more my wife and I lived in an apartment building in Watertown, MA with tenants that were mostly married HBS students. I was out of college a couple years and working. I got to know some of these HBS students and got to see them huddling with their "case study" approach.
I remember one discussion about mortgages with me trying to convince one of these folks that at the going rate, over 30 years, a person would pay in 2 1/2 times the amount borrowed. In the time I had and without paper and pencil, I failed miserably to convey the power of interest compounding and time. That kind of knowledge should be ingrained in an HBS student. It's anecdotal and only a single sample, but the HBS focus appears to be very short term.