QA Perceptions or end user needs

During the software development process, we come across situations where the team would brainstorm on how the end use would use a particular feature, or the steps the end user would do to get a certain task accomplished.  In most of the cases these small details cannot be validated with the customers. In such instances, The Developers take help of the QA personal (as an end user representative). Often the QA team has a different perception as against the developers. Then usually the Implementation happens in accordance with the QA recommendations.  

 

I tend to wonder these days, if we are developing the product according to the QA Team members’ perceptions or what the end user requires