Some people have a knack for seeing the inevitability of failure and try to contribute by pointing out imperfections, road blocks, and problems. That has to be the least useful talent. Foreseeing tragedy.
A slightly less useless talent is that of finding good ideas- issuing approval of the vision without a thought toward how it could be made reality.
More useful still is the talent for knowing how to plan the execution of good ideas- knowing how it should work, at least on paper.
But really, the only thing of any value, is the talent for making ideas happen- despite the objections of the less talented.