In my case I managed to scale Rails (a Ruby web framework) both vertically (of course this is always simple with resource lakes like some cloud providers are of

In my case I managed to scale Rails (a Ruby web framework) both vertically (of course this is always simple with resource lakes like some cloud providers are offering) and horizontally. For example I can spin up as much pods on GCP or dynos on Heroku without doing almost any changes in my Rails app. Things are even more simpler if I would use Sinatra. Of course I am not asserting here that Ruby is a fit for all types of web apps. But what I disagree with your statement that sounds like a very general conclusion stating that Ruby is not scalable. So talking specifically about programming languages and not frameworks, how do you scale Java or Go without operational overhead?