I remember reading something Pohl wrote about how he thought editing a story while it was still a computer file contributed to a certain degree of laziness and probably wouldn't work well. So, once he finished writing something, he said, he printed out a copy-- and erased the file. I thought that was a very strange way of doing things. However, we must remember that, as dasmiller noted, Pohl was born at a time when movies didn't even have sound. His attitude about erasing files once he had a hard copy might well have been an emotional artifact from his years of using typewriters.