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This seems exceptionally misguided and short-sighted. The example the author cites is for his blog. 50% of his blog traffic comes from search engines; he doesn't do SEO, therefore SEO is a waste of time.

Has the author ever attempted to land competitive keywords in competitive markets? Has he tried bringing in direct sales leads through organic search-engine results?

People who are really good at SEO can show legitimate improvements in sales from their SEO tactics. It's not simply a matter of "if you build it, they will come". Yes, maybe they will, but when?

Does it make more sense to write awesome content about, let's say, vitamin supplements, for four years, get a nice following and hope that some people buy from you? Or does it make sense to try to jam your site onto the first couple of results for "vitamin suppliments" on Google by employing some of the SEO tactics the author considers a waste of time?