Being a football manager is about more than just a series of spreadsheets. Stats, fitness, and financial decisions all matter, of course, but football is, ultimately, a game played, run, and enjoyed by human beings. Humans who are flawed, under extreme pressure, and driven by emotions as much as they are exorbitant wages—although the latter certainly helps.
It's the focus on roleplaying a manager as a person, rather than just a results-generating machine, the feelings and expressions between the readouts and the menu screens...