I read an interesting joke few months back (not sure where, might have been in Capital Minded), the gist of it was basically:
If 99% of people who buy corporations for a living can't beat a monkey throwing darts over time...why do we believe people who run corporations for a living are any smarter? They're both looking at the same corporate balance sheets and industry trends!
I mean, it makes intuitive sense. For a fully scaled company in a legacy industry, what would really change if we removed the CEO and replaced him with the Janitor? The business will still be subject to the greater trends of the market and its industry. It doesn't take a Harvard MBA to take a data input like: electric cars are the fastest growing automotive segment therefore...my auto company should probably invest in electric cars?
Edit: where I think this could fall apart is in frontier industries like tech. The decisions require much more specialized expertise and the industries are much less mature (ie. Say ridesharing).