Once you see that an answer is not serving its question properly anymore, it should be tossed away. It's just their natural life cycle.
They usually kick and scream, raising one hell of a ruckus when we ask them to leave. Especially when they have been with us for a long time.
You see, too many actions have been based on those answers. Too much work and energy invested on them. They feel so important, so full of themselves. They will answer to no one. Not even to their initial question!
The hardest thing about customer interviews is knowing where to dig. An effective interview is more like a friendly interrogation. We don’t want to learn what customers think about the product, or what they like or dislike — we want to know what happened and how they chose... To get those answers we can’t just ask surface questions, we have to keep digging back behind the answers to find out what really happened.
Domain specific UX means understanding how the supply should fit the demand considering a specific situation and use case.
On the other hand, many aspects of UX don’t require knowledge about a particular situation. They‘re based on the common constraints of human sense faculties, memory and cognition or the net of ergonomic factors around the device and the setting where it’s used. These domain independent elements of the UX are important too.
Domain independent UX should absolutely pervade the organization. It belongs to the general skill and knowledge of each supplier at their link in the chain. It’s part of learning to be a good designer, programmer, marketer, salesperson etc.