Stories have a lower cost of production, which also permits for a wider variety of topics to be covered.

Thr lower the cost of production, the better you can do a better job of covering the long tail, providing smaller quantities of stuff that’s more niche or specialized, and have a smaller pool of people who are interested in it.

https://en.wikipedia.org/wiki/Long_tail

In business, the term long tail is applied to rank-size distributions or rank-frequency distributions (primarily of popularity), which often form power laws and are thus long-tailed distributions in the statistical sense. This is used to describe the retailing strategy of selling many unique items with relatively small quantities sold of each (the “long tail”)—usually in addition to selling fewer popular items in large quantities (the “head”).

Anderson cites research published in 2003 by Erik Brynjolfsson, Yu (Jeffrey) Hu, and Michael D. Smith, who first used a log-linear curve on an XY graph to describe the relationship between Amazon.com sales and sales ranking. They showed that the primary value of the internet to consumers comes from releasing new sources of value by providing access to products in the long tail.[10]