Remember, success is way more than half luck. Going to Harvard makes your luck much better.
That Harvard Rolodex will get you a job even if your degree barely certifies that you have a pulse.
Hmm. I guess maybe there would be cases like "the school requires you to take at least N courses, and you don't want that much workload (or, more charitably, some of your courses are extremely demanding and you want to lighten the load on the rest), so you take some facile courses". Or cases like Feynman taking astronomy and philosophy to satisfy the humanities requirement. But I don't think there's any case where you'd need to major in underwater basketweaving... unless that is the easiest major and that's your criterion. I dunno, if they want an easy major, can it at least be something useful? Perhaps it's good in some sense if the genuinely useful majors are strictly separated from the easy ones? Hmm.
I think "Communications" seems to have that reputation, and a subject by that name does sound useful for being in a company (I have no idea what is actually taught in it). My brother-in-law said he majored in Communications because it had the lightest courseload, so he could work for Microsoft while attending school.
The parents probably recognize that, if their kid fails miserably at Harvard but manages to graduate with a questionably useful degree, they will still succeed because they'll still be able to flex their network to get a job of some kind with a salary.
Once you have a salaried position your life has a step jump in stability.
Human society, and the economy are not rational. Assuming that they are is foolish.
The idea that "social desirability" does not reflect actually valuable stuff is foolish. Class exists in some form in every society. People are always hyper-aware of class issues, and it has always been a primary part of the college/career decision process.
In the UK, class is still discernible immediately by accent, schools are mostly segregated by class, etc. In Ireland, it's not like the UK... though some Dublin neighborhoods still have very distinct class accents. Even this is dying off. But.. class still exists in a more amorphous form broadly.
I have seen an apparent consensus that the upper class schools and such focus only on prestiege and signaling and then when they are placed in management by other from the background make a complete hash of it while thinking promoting someone who actually knows what they are doing would be an unthinkable faux pau because they might wear brown shoes in London or worse not coordinate their belt and shoes! It doesn't even seem to be a matter of capital given the fact there are apparently plenty of impoverished "patricians" and working class wealth to invest in and they were marrying into money from outside their silly class frameworks for generations.
It seems to be utterly useless on every level yet society still persists for some daft reason. Why not do away with it? Not in the "Get the gulitiones, senseless violence, and the full circle revolution started!" way but "A ignore the useless twits to stew in their own resulting irrelevance." way.
We even take the next step of referring those who point out racism as the actual racists.
If you want to be happy and healthy in America, you must have a way to make money. (Or your parents must give you so much money that you're set for life.)