I've had to do some maintenance on Rails apps in the past, coming from my Java background, and it was painful as hell. It's just what you're familiar with. I can take my Java and Spring Boot, both of which I'm very familiar with, and write an article like that to wonder why Ruby has not something awesome like Spring Boot. But I don't do that, because it'd be equally embarrassing. Spring Boot for me is super productive, has a lot of batteries included, and is a dream to work with, hence I have no desire to play with Rails. Had I stumbled into Rails development, as a career path, I'm sure it'd talk about this the opposite way.