This is quite the intersting article but I would point out that since most startup owners/product managers do not know the edge cases of their problem or where the tech might fall short, then it is our job as software engineers to actually ask the questions which will drive the owners to actually fill the steps you mentioned. Only then will estimates be sensible and the job done :)
First of all, thanks for the comment!
Although I agree that since a non-technical entrepreneur might not necessarily have enough knowledge to determine edge cases, it IS their responsibility to correctly lay out, to the extent of their knowledge, how the solution they are envision looks and works like.
Not providing enough information leads to poor estimations and it's very important that the startup owner can communicate his vision of the product to the rest of team so they can do their job as best as possible.