HTML 5 Doctor w3Schools Reference

Bots, search engines, and other web page analyzers rely on the structure of your page to figure out what's on your web page.

When search engines show you links that are contained on a page, they're relying on being able to find the navigation on your page.

Screenreaders need to know the structure of your webpage so it can acurately describe the page and allow the user to easily navigate to the correct content.

Semantic Sections