A prototype is simply a representation of how your product will work. It can be functional but only to the point that it conveys the most important capabilities to your customer.
When you have a prototype, you can begin to get real feedback from your your customer. You may even be able to sell the prototype, which is even better.
Entrepreneurs don’t paid to design great products. They get paid to sell products that solve customer problems. Great design is part of that effort but only in balance with delivering a minimally viable product initially.
If you get your products in the hands of your customers as soon as possible, they will help you design greatness, and it will come most likely in a simple form.
Rob Adam’s “If You Build It Will They Come?” is a great blue print for understanding customer value.