Expertise is an odd raw material. The more years you spend in a domain, the easier it becomes to forget which parts other people cannot see. You can answer a question in thirty seconds because you carry ten years of context in your head. That is useful in a conversation. It is not yet a product.
The product starts when you make that context accessible to someone who does not have it and does not want to spend ten years acquiring it.
Choose the moment of need
The instinctive response to a complex domain is to build a comprehensive reference. Sometimes that is necessary. More often the user arrives with a concrete problem: “Why did this setting not apply?” “Where can I find this place today?” “How do I turn this picture into an object?” “Why did the AI give me a poor answer?”
Those questions are good design material. They reveal what the person is trying to do, which uncertainty blocks them, and what would count as progress. A useful product can start at that moment and bring in the deeper knowledge as it becomes relevant.
The hardest work is subtraction
Domain experts tend to love the exceptions. Product builders have to decide which exception matters now. That requires honesty about the user’s context and discipline about the first experience. A simple interface is not proof that the underlying problem was simple; often it is evidence that the team did the difficult prioritization.
The same judgment applies to an engineering team. People do their best work when they understand the problem deeply enough to make local decisions, while the product maintains a clear promise to the user. A leader’s job is to create that clarity, not to become the human API through which every decision passes.
Keep the loop short
I like building independent products partly because they shorten the distance between an idea and its consequences. You can put a tool in front of someone, watch where they hesitate, and learn what your expertise caused you to overlook. The user often does not need more features. They need a better path through the thing you already know.
That loop is humbling. It is also the part of product building I find most satisfying.