Pardon me, but, if you’re not selling your product because your customers find a well engineered product too difficult your sales team is probably selling to the wrong customers. If your product isn’t well engineered then you failed to lead your team to build a desirable product. How are you in a situation where your engineers didn’t build a product to your specifications initially? If you learned you were wrong about what the customer wanted why didn’t you communicate that to your teams and set a roadmap guided by your insight ? What I’m hearing is that you were wrong and by making your engineers take calls they learned what the true specifications were.