Mostly, it's because most women don't want those jobs.

In my 60 years, I can't remember a woman who was able to change a flat tire in her car. Women programmer? Maybe 2 or 3.

Among the many female friends I had, practically none was interested in learning some tips about tech (that it could have helped them): tech literally bored them out of their mind. They gladly left those stuff to men.

Are there exceptions? Of course, but it's a tiny minority. Many studies show that, since from their birth, girls are more interested in people and boys are more interested in things: "Men and things, women and people: a meta-analysis of sex differences in interests" https://pubmed.ncbi.nlm.nih.gov/19883140/

It's innate.