This claim is most likely taken out of context. As I've said, every writer struggles with something from time to time but that's not the same as what you've described in your post. I'm sorry if my reply offended you somehow, that wasn't my intention. My point was just that you're overgeneralizing. Every writer has their own work mode and everyone works differently, e.g. the German author Günter Grass used to write in handwritten calligraphy on special paper. What's easy for one is hard for someone else, and vice versa.