Non-technical fields are essential but the training and replacement is much easier compared to programmers profession. Not because programmers are genious talented people, simply because in order for a programmer to stay relevant to the field it becomes a norm to spend every possible waking hour in learning new software frameworks, updating skills. I feel guilty even when i watch competetive programmers youtube channel for entertainment. It is possible to treat the software job as a 9 to 5 job and dont have to spend time in updating the skills outside of working hours which is what a significant portion of the developers in service based software companies do. But it comes with a cost. You are at the mercy of the current employer and if they go out of business your chance of getting employed as a software developer is very low. The skill acquired in personal time is used to make the current employer profitable. With this context when people from non-tech departments like hr and accounting does not respond and tries power play is what makes the developers so arrogant.