What is driving the tendency to discount Joseph Smith's revelations is not that they seem less reasonable than those of Moses; it is that the book containing them is so new. When it comes to prophecy, antiquity breeds authenticity. Events in the distant past, we tend to think, occurred in sacred, mythic time.
The creative process is not like a situation where you get struck by a single lightning bolt. You have ongoing discoveries, and there's ongoing creative revelations. Yes, it's really helpful to be marching toward a specific destination, but, along the way, you must allow yourself room for your ideas to blossom, take root, and grow.