Sure it is. Lack of diversity means lack of understanding about other uses. It also means that biases can go unchecked, and can develop into accepted wisdom.
> Also, why is IT somewhat different?
Because the (false) reasons given for other occupations don't apply at all for tech. "Men are stronger, that's why you don't get women in construction"; "women are nurturing, that's why they make good nurses".
> I don't see much push for more female fishermen or male nurses, to name two random professions with similar disparities.
Have you looked? I'm not sure about fishermen, but there are many programmes to increase the number of men in nursing, or women in construction.