We think it is based on the E.A.T principle. E stands for Efficiency = The web designer doing his job (like a builder building your new house to code). A stands for Authority = Showing the website/business/person is an Authority in their field, legitimate & showing clearly what they do or sell. T stands for Trustworthiness = Everybody else on the Internet you don't control (Reviewers, Facebook, Instagram, linking to your website etc...).
So long story short, Google wants...
The website designer/SEO guy to do his job properly.
To easily see what a business is about, and if they are useful.
Lastly they want the rest of the Internet to back them up.