The method worked in the screencast because one of the Node Keywords was BEND and the other BENDMF - results would be totally different with both Node Keywords as BEND.  Different BEND types could be manually placed but if the Design Line is then put through a sequence of  'Erase 3D Item(s)' followed by a 'Fill in 3D', only one BEND type would survive at both locations. The failure of Design Line to recognize more than one type of BEND (or any other type of fitting), causes additional work for users - EVERY time the 'Erase 3D Item(s)' and 'Fill in 3D' are used in these situations. 

Design Line should allow the user to select the individual fitting desired at each node instead of having the user select the fittings to exclude from every node.