Something I find somewhat odd is that by default, Wordpress always seems to make paragraphs, not divs when you press enter. At first this may seem like the common way to make paragraphs, but it's actually not that common:
- Gmail uses brs, not paragraphs in its editor.
- The Outlook mail online uses divs (or br tags).
- There are good technical reasons the editor would be better to use divs instead of paragraphs, not just because it's more popular. What about shortcodes that output divs for example?