If you look at how IT traditionally spent its investment dollars, there would be a distinct requirement for a positive return on investment by the end of the first three years. Many were long-term IT investments that would determine how you would operate in the next ten to twelve years, and resulted in the definition of many established IT management practices.
But those ancient IT processes and policies used to manage legacy apps are inadequate to handle modern technology updates. Today, most enterprises are much more agile, having moved applications into the cloud, or utilizing the power of Software-as-a-Service. However, most are still maintaining a layer of dinosaur legacy applications and other mission-critical on-premise software in massive data centers. Since most IT organizations are unable or unwilling to change how they manage IT, they still use IT processes and policies that date back more than twenty years!