The markup rules were downgraded years ago. No h1 or title or meta tags shouldn't be the primary cause. Probably more to do with https, mobile and amp than the

The markup rules were downgraded years ago. No h1 or title or meta tags shouldn't be the primary cause. Probably more to do with https, mobile and amp than the above factors. Google has no problem scraping html pages and getting importance and content topics from inbound links, social media links and the actual text on the page.