When we have an assembly of the type weldment, it would be good to admit to create a 3d sketch, in some machining operations like a sweep it is possible to need a 3d path.

You could also add the coil tool that is not available and the loft tool (both in cut mode).
If one has a post-welding machining of a complex type how would you solve it? should create alternative methods as a derived part and assemblies with two representation views for example, or use LOD. These roads could be simplified in a real way with such functions.