Separating feature requests from feature improvements helps keep people informed on what they use most, as opposed to what they could use as an alternative. They would still both count towards the same goal, but coming from different ends, might be a better way to manage what should be looked at first if something isn't a direct bug, but isn't a direct new feature either. With the intent or aim to improve existing product functionality. Without updating new functionality directly. It would be good for minor releases. Where as new features are best suited for major releases so they can be tested and made to work well overall.