I won't quote people as that makes life complicated but as someone who has been handling SEO since before Google existed I feel that not a lot has changed in how professional SEO works. Sure early days due to the backrub algorithm Google created it was possible to link bomb, but when they acquired Applied Semantics with the intention of using it for Google AdWords (as was then) things changed as they had two measurements, value (PageRank) and relevance (semantic relationships).
In 2006, I wrote how while working on a bridal store I noticed that on searches for 'Wedding dress' Google was highlighting 'Bridal gown' 'wedding gown' etc.
I have always been asked how my blog ranked so well when my written English was not that good!
The answer of course was that I wrote naturally and as a result Google detected semantic relevance in the natural language.
Since 1995 when I built my first commercial website I told the client that I was 'not building a site for you, I'm building it for your customers'. From day one, as a marketer I knew that meeting search intent was the key to traffic and conversion, and here we are 26 years later with everyone and their brother evangelising how meeting search intent is the new SEO shiny object
It's like the story of the old bull and the young bull at the top of the field, young bull says 'Hey pops, let's run down there and **** one of the cows.
The old bull says 'go ahead son, I'll walk down and **** them all