Hiring a UX designer is cheaper than hiring a developer. An experienced UX designer can predict the usability issues so that they could be immediately fixed to ensure customer satisfaction. Testing your product in the design stage helps to avoid making changes later on when it’s more experience, both from a financial standpoint and customer satisfaction standpoint. As mentioned earlier, even one bad experience is enough to push a customer away, therefore it is recommended to check the usability issues in this stage only.
Dr. Ralf Speth, who is the CEO of Jaguar land Rover said it best when he said, “If you think good design is expensive, you should look at the cost of bad design.”