Some of these are lower status, and often lower paying, jobs. Others, such as special forces, DO have people pushing for women to be included.

Those fighting for equality are focused on getting equality in great careers, and that's why they're focused on SWE jobs over oil drilling.

You might disagree with them because you think being a plumber really is a good career. You'd probably be right, but that's not how society sees it. Society sees SWE jobs as being much much better, and so that's what's being fought for first.