So there are some jobs that only a biological male can do, that a biological female is not qualified to do? If we made a list, which jobs do you think might be on it?
Getting killed in war is a job much better suited to males. They are more disposable, especially now in the age of sperm banking.
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Nowhere near as binary as your False Dichotomy question makes it, but men are generally better suited to:
dig trenches
carry heavy rucksacks
move weaponry and equipment by hand
survive hand-to-hand combat (granted, their odds are still limited to below 50%)