I would like to point out that the current misadventure in the ME has cost at least $38,035,856,006 in 32 days. And that won't receive half of the "this is a waste of money" critiques this mission will. And there are a ton of people who are against that excursion.
Most people who will come across this will react with either extreme negativity or indifference. Very few people will react positively. This thread itself is evidence of that. This is a nerdy community filled with people who are deeply positive about space exploration and excluding my comments, the straw poll was,
~81 positive (48%), ~43 negative (25%), ~45 neutral (27%).
This is a fair question. The closest answer I can get is eyes and ears onboard complement sensors.
True. I wasn’t thinking about training the ground crews.
This is not just training the current flight crew and ground crews, but is also generally testing the entire system - including operations and hardware too, with feedback important to logistics and component manufacturers, etc. With possible exception of Falcon 9 launches, space missions are still infrequent enough that each of them is providing knowledge and experience meaningfully relevant to all work in and adjacent to space exploration and space industry.
This can be done autonomously. The human training cannot.