If you want to use html templates server side. As soon as someone wants a modern client framework, this rails falls short. Unless there is something I'm missing, please correct me if I'm wrong.
https://hofstadter.io (checkout the docs)
1. Theming/Components so I can make it look good enough that alpha testers don't immediately write it off (A decent looking material design theme with customizable colors would be fine).
2. The pricing model is a non-starter with the current project, which requires us to create dozens of MVPs a year, and move forward with the ones that resonate with customers