I'm in software engineering. One would think that English would be a useless class for my major, yet at work I still have to write a lot of documents. Either preparing new features, explaining existing, writing instructions for others etc
BTW: with using AI to write essays, you generally have subject that is known and that many people write something similar, all of that was used to train it.
With technical writing you are generally describe something that is brand new and very unique so you won't be able to make AI write it for you.