CEO is just a human. With about 16 wake hours per day.
When company get's big enough, the role of CEO gets more and more about enabling the employees to create value. Consistency is valuable on it's own right. And it increases as company gets bigger.
Companies typically have board to put a degree of democracy in the big moves. So that mistakes get unlikely as 10 people are not very likely to do the same mistake at the same time. But they are not part of day to day operations, so they usually suffer from lack of data.
Too many cooks spoil the broth, but a good cook with a hundred scullions can make a lot of good food and investigate a lot of recipes.