As a product manager, you need customer feedback at every stage of the product development lifecycle to inform your product decisions and help you establish a foolproof product strategy.
Before you even have customers, feedback can be incredibly valuable to you. Before a single line of code is written, feedback from real people can help you validate your concept, size up the market, and estimate potential demand. Before shipping your product, feedback can validate whether you’re actually solving the problems you set out to solve and help ensure your product positioning and messaging are effective. As soon as your product has been released out into the wild, customer feedback can help you not only find bugs and technical issues, but also navigate those difficult “what should we build now?” decisions and prioritize your product roadmap as effectively as possible.
https://www.productplan.com/customer-feedback-new-product/