The advice page seems like it could be a pretty powerful tool. When it is enabled (available by request), it is shown to new users. It also forces them to check a checkbox before proceeding (which you can see here by browsing incognito).
However, I don't really like the page as is. The whole page reads like a suggestion ("thanks, I will keep these tips in mind when asking"!?), none of the advice is specific to the site it's on, and it's a little too long for my taste. I want that page to focus on the most common off-topic questions, with links to more in depth explanations on the site's meta. Therefore, I think it would be beneficial to be able to rewrite the entire thing on a per site basis.
Assuming it's not already possible, can moderators be allowed to edit this page? I think moderators specifically need to be able to edit it because it will make it easier to make small edits to the page.