The point made earlier is that most images are "buttons and logos", and while not part of the main text, understanding what they say is important to e.g. the na

The point made earlier is that most images are "buttons and logos", and while not part of the main text, understanding what they say is important to e.g. the navigation or context of the site. For that reason, it's no more clutter for users of screen readers than it is visual users. The "printing a page" example doesn't work, because we still need to navigate pages, see logos, etc.