I have never met a YC company that wasn't thinking about how to build a business. The key thing to understand is that if problem A is 100 times harder than pro

I have never met a YC company that wasn't thinking about how to build a business. The key thing to understand is that if problem A is 100 times harder than problem B, and problem A is critical to success, then you should spend a lot of time worrying about problem A. In this case, problem A is building something that people will want to use. If you fail at that, then none of the other problems matter, because you have failed.