The challenge with business schools is thatvtheyvare schools. To justify their existent they need academic rigor. They also need coursework easily digestible by people from a variety of backgrounds that prepare students for post MBA careers. In general this means accounting, finance and to a lesser degree marketing strategy. What is left out are the harder to teach items - emotional intelligence, judgment, etc. These soft skills come from the school of hard knocks, with perhaps a few short cuts from good mentors. Even when they try, business schools get it grossly wrong when they try to teach these topics.
In defense of the MBA... It is the optimal place to learn Accounting. It's too boring to learn via self study!