Path reinforcement needs Constraints editing options really. When i draw a Path Reinforcement i can specify the length of the rebar. Specifying the length of the rebar is not of much use if i can't link/constraint it to concrete faces. The only way to add constraints to that rebar is by Remove(ing) Path System.
All rebars should have constraints. It is counterproductive to create a Path Reinforcement System, then Remove it, then add rebar constraints.