Entrepreneurship is a career whereby a you can pay to have conversation with a mentor, oppose and do the opposite of what he says you should do, yet succeed in marketplace, not because his words are wrong, but because market do change. A good advice whoever it comes from depends on the shrewdness of the receiver, and not the shrewdness of the receiver on good advice. In other words good advice alone is not enough, what matters is the wisdom of the person receiving it.
Entrepreneurship dictates and focus on what should be done rather than what is actually done. Entrepreneurs should dream about what should exist without becoming blind to what actually exist.
Your heroes are right about the past, but maybe wrong about the future.