Everything can be initially described by an elevator pitch. That's never the whole explanation, it's just a sense that there's something in the idea (or not), a

Everything can be initially described by an elevator pitch. That's never the whole explanation, it's just a sense that there's something in the idea (or not), and allows the listener to decide whether it's worth pursuing the long discussion. It's not a guaranteed indicator, but the chances are better that a good elevator pitch is good because it describes something good.