The ordering of points can be very important:

  Product
  1. What are you building? 
     <= 70 chars

From the post I can tell the author is just organizing deeply considered thoughts. For a consumer of this checklist beware about thinking of the product first. By putting this as the first item, one can fall into the trap of shoehorning this answer into all the following points.

As I'm sure others here have mentioned, fall in love with a problem not a solution or product. Usually it's best to find a narrow set of users who have this problem and explore around the problem to get a better picture of it. This can often lead to a different product solving a more key problem.