The frontier between marketing and product is often loose too. We have
in-product pages that contain marketing content (whatsnew, firstrun come
to mind).
Also, given our growing suite of tests, we have more confidence that
we're not breaking in-product pages. If we want to reduce the risk of
product related changes breaking the marketing site or the opposite, I
think we should automate most of the product related changes (like
release notes, redirections depending on the current Firefox release, etc).
So like pmac, I believe we're fine with the current setup.