Technical purity and premature optimization do not matter in the beginning. You can always achieve these things at a later stage when you bring on more experts

Technical purity and premature optimization do not matter in the beginning. You can always achieve these things at a later stage when you bring on more experts and specialists. The things that matter are: productivity, mature and stable framework code, and a solid set of libraries to pull for common tasks/integrations. These are the areas where Rails really shines and it's one of the reasons it has become so popular among early stage startups.