I think you're failing to understand what actually happens in hiring rounds. You stand in front of a whiteboard to showcase your knowledge on abstract topics like systems architecture. This is exactly what happens in the real world in design rounds. I lost count of the amount of time I spent in front of a whiteboard this year alone. Perhaps you don't work with systems architecture, but if you are applying for a position where in the very least you are expected to have a cursory understanding of systems architecture, you are obviously expected to showcase your skills to help hiring managers compare you with other applicants.
And no. The point of whiteboards is not to solve problems. Their point is to help you present and clarify your thoughts in a dialogue with people in the room. It's a communication tool.
