I agree with the overall sentiment. After having worked on backbone, then angular and now react/vue apps I find that we often spend more time figuring out how to do things and futzing with the configuration and tests than we spend actually writing useful app code. Our approach after much hard earned experience mirrors somewhat what he is saying - 1. Rails monolith with Turbolinks. 2. sprinkle React components as needed. We have rarely needed to go beyond this and we find it much (much) more maintainable and stable after a year or two.