I previously asked about bricks in invisible places. Now I have second question. There are some bricks that are hardly visible, and in no way contribute to strength of a model. For example lime brick inside space shuttle or red bricks in the launch platform.
Note, as you can see in instructions step 14 - there is nothing on the other side of red brick. It connects only to the long gray technic brick.
Is there any purpose? Are these bricks there to symbolize something? What's the benefit that would justify cost?