Business Architecture is critical in identifying which organisational assets exist, how they are used, and what can be done to improve their income generation, both operationally and through strategy driven (re)deployment. It enables organisations to do something that otherwise they would not be able to do, again and again.
Many organisations do not have a Business Architecture function because they believe it represents an unjustified overhead cost. I could not disagree more. In reality, centralised architecture is an indispensable asset, connecting strategic planning with operational teams (and operational teams between themselves) to create measurable value for the organisation.