I disagree tbh, the prototype is not the product not just because of technical abilities but also because of product expertese in a topic.

If it was otherwise outsourcing companies would've dominated the market for a long time, but it is with the exp from clients and many users that you get to build a great product.

It takes a lot of time to understand what is the pain of the user, in many cases we know what the problem is but we have not time to think of a good solution to it.