A modern finance function has a mission which goes way beyond just doing the accounting systems, bookkeeping and producing historical financial accounts.  Today a modern finance function must fully work with and support the business, while maintaining a clear command of the big picture and an appropriate  level of critical detachment and control:

For each company the finance function mission needs to be tailored to the company’s business model and current situation and can vary significantly, particularly when a business changes ownership or undergoes significant changes in strategic orientation.