Google updates its search algorithm more than 300 times a year, and each time it does, "SEO" companies (read: the competition) go scrambling.
"This changes everything!" They scream as they furiously and fervently try to figure out how to "beat the system" again.
This trend of "change and complain" happens more and more often as these agencies continue to try and game the system for instant results. If only they knew the one secret to dominating search results year in and year out, even when Google decides to change their algorithm.
Quality content.