SEO has changed so much in the past five years, and some believe it is dead thanks to Google's new algorithm for rankings. This just isn't true. While the old days of being able to provide paid rankings on the first page of Google are certainly over, the need to optimize has not changed.
Google has undergone some radical changes to how ranking works with regard to mobile page viewing in an attempt to be more in-tune with today's rapidly evolving technology. Sites who weren't mobile-friendly will get decreased rankings in mobile search results.
For most people who write articles or content for SEO purposes, it is faster and easier to write short articles that can be posted quickly to keep content fresh and hopefully exciting. The trouble is, in trying to keep up with Google's forever shifting algorithms.