I am inclined to agree with you on your second point-reading non-fiction non-linearly. Also, what makes us feel guilty about the pile of unread/unfinished books

I am inclined to agree with you on your second point-reading non-fiction non-linearly. Also, what makes us feel guilty about the pile of unread/unfinished books is when we subscribe to 'number of books/period of time,' read as a metric. If I have to add anything, I would say that an unsophisticated reader does not stand by the metric of counting the number of books he reads in a year.