Rails will harm the maintenance of your software*

*Is really the accurate summation of the article. And yes, this is well known. Every article about a company upgrading Rails is "it took us several years and only three people died." And we know better than to use MVC nowadays.

No offense to Rubyists, but in the Ruby ecosystem, I have seen a disturbing lack of absorbing information from other programming ecosystems. This article smells like that to me. If you've only used Ruby and Rails, you might not realize some of the dangers and inherent limitations of the design unless you've worked in other ecosystems.