Why Entry/Exit dimensions can't be dropped in the Flow visualization in Analysis Workspace?

Adobe Analytics Components Help  > Dimension Descriptions  > Flow

Adobe Analysis Workspace

Why Entry/Exit dimensions can't be dropped in the Flow visualization in Analysis Workspace?

Dropping an Exit or Entry dimension into flow visualization in Analysis Workspace would be redundant. This is because the flow visualization will already convert any dimension that is dropped in to be Entry or Exit. This is how it has been designed currently.