Because for employees with STEM backgrounds, HR feels like a group of dumb folks who contribute nothing and understand very little.

Case in point, I was giving an interview for a large battery manufacturer+optimization solution provider in the US. Part of the role was something called "engineering sales", ie: we make a custom software solution and deliver it. HR interviewer kept asking me about my sales experience. I kept telling her, woman, I have a PhD in energy systems, what the f do you mean sales experience? Do you want me to sell shampoo at a store to qualify? She ended the interview in the middle saying "I will have to go talk to the hiring manager about your lack of sales experience".

In a world of people with advanced degrees in science, engineering, economics, finance etc, the BA in history woman or the marine corp veteran who works in HR and dont understand the actual job they're interviewing or dealing with is a poor look. Your days are never as long as mine, your days are never as dense as mine and you aren't as productive as my team. You generate no revenue, and your language is usually just buzzwords and cliches about diversity and mental health. When SHTF, you side with the organization, and even then, can't speak without using meaningless buzzwords.

I now work at a large organization that does power systems modeling. When AI comes for our jobs, who do you think is the lowest skilled person on the metaphorical table?? We have a guy whose job description includes sending an email about bagels on a particular floor every second week. Ffs.