> I may have an overly STEM-centric view

This is likely; international vs. US also probably makes a difference, as three of the last six US presidents (by person, not year) were Yale alumni (no MIT alumni have yet become president, but I think it's a good idea!)

And five are Ivy League grads: Obama from Harvard Law School, and Trump with an undergrad degree from Wharton/U. Penn. (Biden being somewhat of an outlier, having attended U. Delaware and Syracuse University.)