This (and another comment you made deeper down) make me think you may be stuck on the mechanical/technical side of SEO. While it is important, it is not nearly as important as it used to be, say 10 years ago. It's probably much less than 50% of your overall ranking. Yes, you need to get it right, but relevant back links and the associated link text on the sites linking TO you will have a far greater affect. Google prioritizes what OTHERS say about your site more than any factors you can control. Mainly because people abuse those factors significantly.
This. The number of sites you see following pretty much none of Google's suggestions or industry practice, but dominating search results due to a combination of content and links, is massive. If people stopped and thought about what they're looking at, the "selling technical SEO knowledge" industry would pretty much die.
