Many SEO practitioners still apply optimisation techniques like in 1999. Back then popular belief was that it was perfectly enough to lure Internet users to a website with whatever means it takes and then everything else would would work fine. Things like readability were far off the SEO agenda.
For a few years now the SEO industry focuses on conversions, that is converting a website visitor to a client through web design for ROI. In order to achieve that the foremost task is to keep the visitor on the page in the first place. 
