If you allow organisational departments to operate autonomously without coordination of the work across departments, then you get this siloed behaviour where the overall benefit to the organisation is lost. It is critical to take a holistic approach to the management of the organisation to best utilise the skills across the business.
If you look at functional people –people who work in the normal part of the value chain – they have to perform to the processes that have been defined, and quite often that is in light of any standard operating procedures an organisation might have. These procedures need to make sure people work in a compliant fashion according to various regulations appropriate to that position.
Rather than just having a high level job description, it is actually the accumulation of responsibilities. Which creates a much richer perspective of what that person has to perform.