I always thought #6 was wrong. GWT in my opinion is a great tool set.
I have to admit, I'm on the fence about sitemaps.
- The good thing is that they help Google find all your content.
- The bad thing is that they help Google find all your content.
If a site has navigational issues or dead-ends that prevent proper crawling, those pages will not be indexed. That can be an alert to the site owner that there is a problem.
On the other hand, if they use a sitemap that points to all the pages, those pages will at least be crawled. What's the downside? There are two:
1) It hides problems
2) It weakens pages
If I have a page that is not properly linked to, so that a normal crawl won't find it (or not as easily) then having a sitemap trigger the crawl means Google sees few or no incoming links to that page - therefore the page has no "strength" and is unlikely to rank for much, will get a slow crawl rate and get the supplemental treatment as a low quality page.
If I diagnose the crawl problem and let the SEs find the pages naturally, the pages will build more PR and be likely to rank for more.
So, a sitemap can get you more pages crawled - and may even force the SE to discover more internal links which can strengthen the site - or lead to indexing of weak pages with no incoming link juice.
Ryan