Well found Brad!
I didn’t know that; as NURBS are (weighted/ Non-Uniform)) B-Splines and B-Splines in Blender by default do not reach the end Control Points:
,
I just accepted it. Well, to be honest, I never use NURBS (they are really under-developed in Blender).
But if you want to change the Weight of a Control Point, that is done with the W value (not with the Weight (that is the Soft Body Goal Weight)):
