As for being daft and dangerous, many good ideas are triggered by something that is in itself obviously not a good idea but that set someone else thinking. That's why we have brainstorming sessions when creating new concepts, daft and impractical ideas often lead to a workable solution. The initial idea may take three minutes, turning it into a workable solution that achieves an acceptable increase in weight, doesn't compromise safety, isn't too expensive and has a low failure rate, may take months or years. Understanding why an idea is daft is progress towards a solution.
Very well said indeed. It's the very nature of engineering.