I would argue that framework isn't the winning component, the people are. A lot of people can say similar things for framework <<X>> and they'd be right given their own experience but I think they give themseleves too little credit. I've written my own frameworks for smaller projects because I didn't want the needless learning curve / cruft of a generalized framework and I can tell you they saved me so much time / effort / cost over the long term and they were tuned to my development style. All built with python and some off-the-shelf libraries. I'm not saying there's no place for generalized frameworks. They do help streamline development efforts and set a standardized model for building out your app/service which would be great with a team of people all tuned in to a specific framework but I would argue that in a single developer environment it doesn't matter much what you use, so long as you have fun with it. Productivity analyses are at best personal opinions in a forum like this.

Edit: basic grammar.