The final paragraph seems to answers his question with the statement that it is simply "what he knows best". And in fact the rest of the article backs that up

The final paragraph seems to answers his question with the statement that it is simply "what he knows best". And in fact the rest of the article backs that up with his lack of information about alternatives (as many of the comments here point out). There is nothing wrong with going with a solution because it makes you more productive for your small problem, but trying to make any conclusions beyond that seems forced. I am 100% sure that there is someone who could write the exact same article, but instead they use a single Linux box with PostgreSQL, emacs, etc because it is simply what they are comfortable with.