"Rails has scalability issues Not true. Ever heard of Basecamp, Groupon, Airbnb and Shopify?

Well, they are all built with Rails. So, this Ruby on Rails criticism is totally uncalled for.

The first thought of RoR being difficult to scale appeared when Twitter had switched from Rails to Scala. It was thought that if such a big company, like Twitter, abandoned Rails then Rails must be no good. But time has passed and has shown that other corporate giants have stuck to Rails and have had an awesome journey with it." https://sloboda-studio.com/blog/ruby-on-rails-criticism/