Final answer:
The rapid prototype of the HCI of every product is necessary.
Step-by-step explanation:
The rapid prototype of the Human-Computer Interface (HCI) of every product is not optional, it is necessary. Rapid prototyping is an iterative process that allows designers to quickly create and test different versions of the HCI. By creating a prototype, designers can gather feedback from users, identify potential issues, and make necessary improvements before finalizing the product.