Basic geometry: Two points make a line, Reference Line = checked. Three points makes a plane, Reference Plane = checked. But Reference Point is no where to be found.
We need Reference Points in Project and Family environment (similar to what is in Conceptual Mass or Adaptive family). They are useful for:
1. Constraining rotation of elements: Lock the base point of an object to a Reference Point and provide a parametric angle to control the rotation.
2. To be dimension witness elements.