FWIW, I submitted this link here because I found your blog post immensely useful. Its an excellent intro for someone wanting to integrate text search on their site in a few hours. I think the title has led a few posters here to believe that you are recommending it as a panacea for search.

Although you have listed a few points where full text search is not enough, it might be a good followup to explain some cases where ElasticSearch / Solr / Sphinx etc. are needed.