Basically a single surface like Network is going to generate should be more like a single shape in a broad sheet. If you have tight bends those are transitions between broad sheets and it will be difficult to form them well if you try to "bake" them all at once into a single surface like Network will generate.

Usually it is best for tight bend areas to be done as fillets that transition between separate surfaces.

Additionally trying to use Network to do the whole shape as one single surface will also need a "pole" in it and it can be difficult to avoid visible evidence of the pole structure in the shape as curves collapse down to a single point.

- Michael