In my opinion, there are two problems with sections.
1. The are one dimensional, whereas profiles "flatten" the piping into one dimension - so they can "follow" the entire length of piping.
2. Often the scale on profiles are not the same in the x/y direction. The y dimension is typically less than 10-20 feet, but the x dimension can be 100's of feet. So unless you make a section which takes that into consideration, you would have a long section on the drawing.