It only seems universal because the management universe has ben captured by the MBAs. All upper management feels the same way because they were all largely trained at the same few MBA schools.
I don't see that distinction mattering all that much. What matters is that people with a specific mindset come out of these MBA schools that also have formed strong networks there which help them win the power and status games later on.
Reckon the cost of doing an MBA has a big role to play in this. MBAs are just stupid expensive. If you’re 200k in debt at graduation, you’re likely going to make conservative choices in your career.
Siding with the in-group and perpetuating the bureaucratic structure is one way to ensure that you stay employed.