Ehhh. There's only about 360k welders in the U.S. and 3.6 million software engineers. That's an order of magnitude in difference in impact.

Additionally, a software engineer probably makes more than a roofer, welder, and kindergarten teacher combined.

Part of the reason for studying software engineering is because it's part of a larger trend of women not being as prevalent in high-paying careers. That's also why the number of women CEOs and other leadership positions gets so much attention.

So, while I understand your point (there are any number of careers that have huge gender gaps that no one is looking at), software engineering is specifically scrutinized due to the number of current jobs, the average salary, and the expected growth of the profession over time. No other field has the kind of potential impact on the employee that software engineering does.