"Human beings are the most important, potent and critical, resource of any organization, and yet the least understood and the worst managed of its resources"
Human beings are of utmost important in any corporations or companies and it is a vital instrument of success compared to machines. Machines are fast in calculations, but they only obey a certain commands and they will only follow the instructions of the smarter beings, namely, the human beings. Unlike machines, human beings are miles smarter due to following our instincts of what's right and what's wrong - which is also considerably the negative aspect of it. Human beings follow what they think is right and what they think is wrong so no matter how much you give instructions to them, they can be quite unpredictable. Another reason why human beings are hard to manage within a corporation is due to the fact that they have what we commonly call as "feelings" unlike machines.
We human beings need to have a comfortable work environment to give our best but if a corporate can't comply to that, human beings can go against them. Machines follow instructions without complaining but that's the worst scenario of it - they will follow a management without thinking whether it is the right decision or not. Unpredictability and proper accomodation is the reason why human beings are hard to deal with.