I ran into such serious issues with Django and Django-CMS that we were unable to upgrade a Django 1.7 app to 1.8 without a ton of work and the possibility of data corruption. "Kitchen sink" frameworks like the ones mentioned above often lead to issues like this. I don't use Play framework any more when writing Scala. That being said, Rails truly was the pioneer for this type of web application programming. Many of the other frameworks are just copy cats.

Yes, I had a feeling Rails was getting singled-out unfairly. There's nothing about Rails which is more monolithic than, say, Spring, Django, Play or Laravel.