Comment on Yoast WordPress SEO Plugin Review by Mike Johnson.
I have to disagree with you. It is not damaging to a site’s SEO to keep from indexing Categories and Search Results, etc. Why? Duplicate content. By noindexing these you actually increase your site’s SEO by removing the duplicate content penalties you may incur otherwise. Also, it is highly recommended that you allow either your Tag Pages or your Category Pages to be indexed, but not both. I recommend to my Members to ALLOW the Tag pages because they have the most avenues through your content. Search Pages only get created when a user searches, so why is that even close to being relevant?
There are quite a large number of things wrong with your article and while it seems you understand WordPress fairly well, it seems you do not understand WordPress SEO very well.