I think this response -- and its popularity -- is an indication of frustration people feel with their ideas piling up and the sense that they aren't "doing" any

I think this response -- and its popularity -- is an indication of frustration people feel with their ideas piling up and the sense that they aren't "doing" anything with them. The ideas we do work on happen to be the ones the rest of our lives push in front of us. This may or may not be the optimal strategy for developing ideas.