I've built a few companies. I think it's super valuable to have some on the team who doesn't give shit at all about the tech and only cares about a) is this the right problem and b) who cares (read: pays).
This person helps you focus, forces (if given authority) the tram to focus on "things that move the needle". Devs and designers simply lack that customer-development focus.
I think every team would benefit from a qualitative analysis role like this - regardless of title. I have one now. We argue every day, but the balance of perspective is key.