Also, every decade had it's most successful degree.
There was CA, Engg, IT, MBA in their respective decades. Respective skills were in high demand in the job market during respective decades and respective people when they entered were paid well, had a great headstart and succeeded to top positions because of that. It was just being in the right place in the right time.
If you backtrack a 2024 CEO to his graduation field to do a MBA, you might face and climb a similar career ladder 30y from now. It's like buying HDFC bank in 2024 and expecting a 20% CAGR till 2054 coz it did give 20% from 1994. Times change, so winning formula changes too.