what the implication of that statement means, is that the power lines do not lead the eye to any prominent element in the photograph, NOT that the lines just go off into space.
as far as overthinking photos...
you are posting in a photography forum. the are quite a few professional photographers here, many very talented enthusiasts, and a mix of other people of varying skill levels and experience. The idea behind improving is that you go from just running out and snapping a picture, to being able to visualize the end product before you even frame up the camera. When people talk about preparation, what they are telling you to do is LOOK at what you are thinking of taking a picture of, and THINK about what you feel the end result should look like, what you want the subject to be, and what you want the picture to say about that subject. along with the technical skills involved, that is what makes the difference between a "snapshot" and a "photograph" (as a general rule)