Embedding image within pages of content helps both within the design of the page and when shared on social media. If you set up meta tags to point at a particular image then that image will appear when the page is shared on social media. This makes your page stand out more.
A while ago I added a header image to the articles in the form of a field that references a media item, which is quite typical when adding images to pages. To add an header image to an article I just had to upload an image and Drupal would handle the size, placement and meta data for that image.
With the field in place, however, I spent a while adding a default header image to new articles so I haven't been making good use of it. My GIMP skills aren't that amazing and so the prospect writing an article and spending time fiddling with text elements on an image every week wasn't that appealing.