Heading content in a footer element

Hello,
My apologies if this question is because I don't understand the spec. In
3.8.8 (The footer element), the content model excludes heading content
descendants. I don't understand why this is so.

As an author, I like to put headings at the top of each section (whether
it's a nav, section, article, or even a footer element). This especially
aids screen reader users in skipping to a certain portion of a document (in
Jaws, I can flip through the headings in a document to get to the footer
quickly). The footer typically has contact information and links that aren't
present in the rest of the document, which makes getting to the footer,
quickly, especially useful.

Are there any reasons why this should be disallowed by the spec?
-Chasen

P.S. The copyright information in the examples for 3.8.3 and 3.8.7 should
probably have a small element around it. It might even be a good idea to put
rel="license" on that copyright link in the example for 3.8.7 just so
authors see that in practice in the spec.