If I've analyzed logs' link tracking list correctly, the list contains only links to destinations outside the email. It does not list any anchor links (that is, "jump" links that scroll the reader to another point on the page).

It is potentially as important to track these as to track external links. For example, if I have a table of contents at the top of the email, and someone clicks on a link in it, it tells me of their specific interest. If, then, they do NOT click through to our event (or whatever), I know they were interested, but we didn't sell them.

If only the external link is tracked, I learn nothing, because they didn't click it.