I think its more common that developers forget the huge amount of domain-specific knowledge the users have - not about development but about the problem the sof

I think its more common that developers forget the huge amount of domain-specific knowledge the users have - not about development but about the problem the software is trying to solve. Always focus user research on what the end user is trying to accomplish. Then design the simplest way to solve their problem and present it to them in some kind of prototype/mock/wireframe. Ask them to walk through it mentally with common situations, then ask them to evaluated it in their less common scenarios. Then finally you can ask if they have any suggestions. Take this new information back and repeat. Designing an interface is not a technical problem like configuring a server - it is about communication.