Wow. I could not agree less with this whole article.
After being a programmer through many years and languages, I chose Ruby because it is just simply the best language out there today in many ways. And Rails, because it is without any doubt the most capable of all the web frameworks for Ruby.
I did not -- even a little -- choose Ruby because of Rails. I chose Rails because of Ruby. Together they are simply awesome... and I say that despite the over-use of that word in recent years.
My strong opinion is that this article represents "rationalization" of why people choose RoR over Python and its frameworks. But rationalization only works for a little while. Eventually, the truth comes out. RoR is simply superior. That is why people like it.