jakebohall - 3:36 pm on Jun 14, 2013 (gmt 0)
Use of keywords in anchor text used to be very important, and now carries a high risk potential.
Google's algorithm is dedicated to identifying relevance and authority.. Years ago, relevance was given by showing a large number of the keyword on the page (why keyword stuffing worked), and getting links with that phrase... authority was determined by the number of links you were able to acquire and the authority of those linking to you.... This resulted in a lot of anchor text specific links from SEOs.
With the advance of LDA, topic modeling, and knowledge graphs, relevance is more reliably identified by simply looking at content onsite and the interactions of people with the site (think Panda).
Since most naturally occurring links carry the brand name or the url as the anchor text, those that try to game their rankings through link acquisitions stand out like a sore thumb against a natural backlink profile. Links still carry a lot of weight for authority, they just need to be more natural... which means more natural anchor text, more natural placements, and a more natural "growth" rate.