So, you're writer! I remember reading an article by Peter Drucker[1] a while back about how different people think differently (obviously) and one that resonated with me was people who write -- i.e., sit down and write your thoughts and structure them to develop an idea or POV. I am 100% this, versus say a visual or auditory brainstormer.
Do you delete it all because you're worried about keeping it? I keep my notes but rarely return to them.