[benologist]

Today everything SEO is a combination of educated guesses and common consensus. Even with incomplete or flat out wrong information people still successfully manipulate rankings to push good or bad content higher.

There is nobody out there who knows exactly what is going on or whether your redesign is going to help or harm or whether your content is the best it can be. But they will charge you lots of money to apply what they've observed to work before or to automate processes and monitoring and performance.

All of this happens today without any specific clarity into how Google works, I don't think it would worsen the situation if the guesswork was taken out of the equation - sites with no SEO still won't matter, sites with SEO still will, and bad people/sites will still be an on-going game of whack-a-mole.