I agree, but that's really true for questions like "does it run fast"? And those kind of arguably fit into the "legible" camp. Whereas "is it fun?" is a questio

I agree, but that's really true for questions like "does it run fast"? And those kind of arguably fit into the "legible" camp. Whereas "is it fun?" is a question less able to be formally tested and articulated. It's "illegible". The tighter feedback loop that helps to answer that question comes from dogfooding.