Images "Link to: attachement page" harmful?

Hi there,

I was wondering: when you upload an image to a post, the “link to” is automatically set to “attachment page”. Now I’ve read this on a blog about wordpress: “Make sure your blog does not generate any attachment pages, by choosing to link your images on your post to the original image file, rather than an attachment page.”.

This because linking to an attachment page would create low value pages.

Is this something I should take into account? Is it somehow better to do “link to: media file”?

Thanks!