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I agree with you that all other things being equal, a man is more of a threat to a woman than vice-versa, but rarely are all other things equal.
You do not need to be a strong or highly trained woman to grab a man by the head and plunge your thumbs into his eyes. For that matter, any woman get kick a man very hard in the shin and hurt him badly.
No matter how strong a man is, he'll never be able to grow muscles over his eyes or throat or groin or shins or kneecaps or insteps, and with a little training a woman can learn how to attack each of those. Also, can woman can pick up a blunt object or a knife, or even a gun.
A woman may have less strength than most men, but given some training,she can pose a very dangerous threat to any man alive. The fact that too many women already assault men (in one-sided assaults) demonstrates that women should not be dismissed as "the weaker sex," except maybe in a weightlifting competition.