In my experience, having a common repository of elements we can use (i.e. a template) speeds up development and increases the maintainability of the code since everyone references a standard within the codebase. That's what made Twitter Bootstrap so successful. Arguably, it makes it more motivating to code in development since it feels it's good enough, if not polished, already.
With that said, I never intended to have a template replace proper wireframes. It just makes breathing life into the wireframes easier and faster. It makes it easier to do experiments and thus we can refine the workflow faster.