Sensors are better than a human in a space suit at sensing. What spacecraft far away from Earth are not good at is thinking. Rovers and now helicopters on Mars would be getting a lot more science done if there were a human nearby - not 15 light minutes away which makes active control impossible from Earth. Driving a rover would certainly be faster if there were a human in the loop. Also, if humans were nearby, you wouldn’t have to be quite so careful in the design of the rovers. Now if something breaks, the mission is finished. With a human nearby, they could fix it and send the rover back out. There are lots of reasons a combined strategy of humans and robotics would be a great benefit.