I am also a writer by profession, so I feel your pain. If the Terminal line didn't work for you (and you are sure you copied it exactly) perhaps you need the double whammy of a hardware fix and the Terminal fix. Before I had my top case replaced, my cursor was insane, skipping two or three times a sentence, sometimes right out of the app I was working in. After the top case was replaced, skips were much less frequent - though still present - and the trackpad was much more responsive to things like click and drag or even to taps. I did note a positive change after the hardware was replaced, but the flying cursor was the worst for me and still happened occasionally. Then, adding the Terminal command solved that problem entirely, at least for the past 2-3 days.
I do see more problems with Apple software recently, though the software is also trying to do much more than it used to. I still love OS X and iOS and wouldn't think of using anything else. My worst hardware problems were with my 2006 white Macbook - the first in the series - which had multiple issues throughout the five years I used it. The difference was in Customer Service, which I agree has gone downhill -- or maybe it's just bad in Toronto, where I am now. I hope that's it, because their speedy and cheerful repairs of my poor 2006 model -- including free repairs AFTER my AppleCare expired -- were what really hooked me on Apple.