"The blank analog page, once marked, can't be made blank again. That's its killer feature."
I like that!
I always write in pen, not pencil. I know that if I used a pencil there would be the temptation to grab an eraser and edit on the fly. Yes, I cross things out when using the pen but the original words are still there suggesting alternate possibilities that I may wish to explore later even if I don't want to use them now.