How can companies ensure that employee input in interface design reflects the needs and preferences of the end users, while still aligning with the company's overall design vision and brand identity?

Companies can ensure that employee input in interface design reflects the needs and preferences of end users by actively involving end users in the design process through surveys, focus groups, and user testing. They can also establish clear communication channels between employees working on the design and end users to gather feedback and incorporate it into the design. Additionally, companies can establish design guidelines and principles that align with the company's overall design vision and brand identity, while still allowing for flexibility to incorporate user feedback and make necessary adjustments.