On the contrary, most of those who are interested in addressing gender imbalances in fields like computer science are simultaneously interested in addressing the gender imbalances in "unsexy" jobs, since these are just two sides of the same coin. Since higher paying jobs in fields like computer science tend to be had by men, the individuals who tend to hold the "unsexy" low-wage jobs tend to be women. The fact that people don't explicitly name the unsexy occupations does not entail that nobody cares about their gender imbalances.
The reason that high-wage positions are usually the positions of focus may simply be a product of our tendency to be more interested in leveling up rather than down when it comes to addressing distributive injustices.