On Page Optimization - Not so Important

Accidental SEO Tests: When On-Page Optimization Ceases to Matter One of our earliest accidental SEO tests showed that title tags don’t impact rankings at all on a well-optimized page. Our theory is that there is an on-page optimization saturation point, beyond which further on-page optimization no longer improves your ability to rank. https://moz.com/ugc/accidental-seo-tests-when-on-page-optimization-ceases-to-matter