The whole enterprise of teaching managers is steeped in the ethic of data-driven analytical support. The problem is, the data is only available about the past. So the way we've taught managers to make decisions and consultants to analyze problems condemns them to taking action when it's too late.
I kind of dislike 'For Whom the Bell Tolls,' but most of Hemingway in general, mainly because his stylistic shenanigans ruined so many young writers of my generation who tried to imitate him. I think, for his time, he moved fiction to a different level stylistically, or at least added to the dialogue, but in our time, he's annoying.