I may be too cynical, but I assume most MBA curricula do not contain bounded rationality ot behavioral economics at least as obligatory subject, but are happily restricting themselves to the world view of 101.
Business programs LOVE behavioral econ. You get Nudge and cognitive bias stuff starting in undergrad business classes.
And other than the econ classes, business classes aren't modeling behavior or doing much theory work, so they aren't making assumptions like rationality.
