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People tend to find things that they have done for a long time less complicated than something new despite it actually being quite complicated. I always ask people when they are debating stuff like this to think about how they would explain it to someone who knew next to nothing about either approaches.

JAM stack development puts the complexity on the build side but pays it back on the operational aspect and performance. I have been a Ruby developer for over 10 years and I will say that React/GraphQL is indeed much easier than a full blown Rails app both operationally and development wise. Heroku is a black box that runs Rails and provides databases/load balancers to back it. Here you are pushing your generated pages to a CDN, and using them to host your GraphQL endpoints.