I disagree, but it depends on your definition of "working well". Yes, Google works better for my mom these days if you measure whether she is happy with the res

I disagree, but it depends on your definition of "working well". Yes, Google works better for my mom these days if you measure whether she is happy with the results she gets. However, the results she gets are mostly misinformation or spam. She just doesn't realize that's the case and is happy with the results regardless. Measuring whether or not results are relevant to the query is the wrong metric to use. You don't want highly relevant misinformation. You want good information.