You might have seen almost all the popular blogs display article summary in their home pages and archive pages.
This addresses those pages load faster, boosts page views, and avoids duplicate content on your website. Some premier themes use excerpts in the case of their post and it makes them more interactive. If your theme doesn’t show excerpts, then make some customizations in your theme.
You just have to do some basic code in this regard to have such an advantage on your site. It seems that sometimes users read the category only but adding this feature to your site makes the user go to those pages as well. It makes two tasks in one action. So, make sure that your theme is excerpting.