In addition to their advantages, periodicals have always had significant limitations.  

Among the most significant of these is their way of shoehorning material that is not time-sensitive into a form that disappears in the space of a month--and sometimes as little as a week.

When a car magazine reviews a particular model, is it reasonable to assume that people are only interested in that car during the month in which the article appears?

How about an article in a women’s magazine on how to communicate in relationships?  Is this information that’s pertinent only to one month, and useless thereafter?