Great point! It's very difficult to build for a domain in which you're not an expert (non doctors building for doctors, non lawyers building for lawyers etc). You're going to lack a lot context, knowing what's important and how people use existing tools (versus what they say about how they use existing tools).

Considering that business is about compounding unfair advantages, if you have to hire people to tell you if you're going in the right direction it's going to be tough.