I definitely agree with what you're saying at the beginning, but I'm not so sure about the end.

I think there is some value in putting humans in space. It certainly seems many scientific discoveries are made by a scientist observing or experiencing something, noticing that it is strange, then investigating. A perfect example of this is the development of microwaves, which came about because an engineer working on radar noticed that a candy bar started to melt when near the radar. Robots are certainly superior by almost every metric once you know what you're looking for, but I wouldn't be so sure that we actually know what we are looking for. Boots on the ground, so to speak, can offer insights that a robot simply cannot.