For many newcomers starting out, the Rails CRUD generators are good enough to generate their entire admin area. And Rails comes with sane security defaults. I

For many newcomers starting out, the Rails CRUD generators are good enough to generate their entire admin area. And Rails comes with sane security defaults. I agree that GraphQL + React will be pretty and work well. But for one-man start-ups, the focus is usually on "looks good enough and kinda works". So I believe I'd go with Bootstrap & Glyphicons, just to get results faster.