The more creative you are, the more bad ideas you’ll have – simply because you’re generating more output. Compounding this phenomenon is the fact that the one generating this body of work is often least able to discern its usefulness or value. In other words, they can’t really tell what’s great from what’s not.
The apparent takeaway here is if you want to create a masterpiece or at least something very useful, be prepared to make a lot of less than great stuff on the way there.