Silly comment imo. University degrees have always been poly-topic in makeup, specifically so the people that come out of the program have some actual worldly context to their knowledge, rather than just a hyperfocussed tunnel vision on their subject of choice - in fact, I'd argue that going all the way back to Oxford, it is one of the distinguishing features of a university degree vs things like certificates. Study the classics and learn from the greats, no matter what your specific focus is.
An economist cannot just study economics. They'd be useless. They have to study it in concert with things like sociology and political science for it to be worth anything at all in the real world.
I did have a chuckle at your example though, because while engineers might be good at their job, they are a famously socially maladjusted group and often give employers and coworkers massive headaches. Believe it or not, social skills are pretty important in the real world when working in teams; maybe if they took a sociology class they might behave less like aliens.
