The people on ISS don’t design the experiments, they just run them. They are equivalent of lab assistants, not professors. Earth-side prepares all the protocols so they don’t waste time.
However, the stress resistance, engineering knowledge to keep ISS alive, incredible discipline to keep up with the requirements of living without gravity, used to cramped and overtly social living conditions – all of these are readily present in fighter pilots.
Pilots need to be smart to get through their training, too. If you pick the best of them, you get very smart, very disciplined people who are willing to risk their lives and stay calm under immense pressure.
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