Not all decisions exist independently.
Some decisions only become meaningful when combined with others.
Budget planning provides a clear example. Individual teams make local decisions but the organisation must combine those decisions into a coherent whole.
A Decision Aggregator collects many smaller decision objects and produces a higher level outcome.
Roadmaps.
Capacity planning.
Strategic direction.
These are not single decisions.
They are the result of aggregated decision flows.
Healthy systems make aggregation explicit.
Unhealthy systems perform it implicitly through meetings and negotiation.