Unfortunately, my update was picked up and shared in the media and the story that has been shared is incorrect. I have contacted the authors of articles which I am aware of to clarify the story, however, I can only control is what I share.
So here’s the full story as simply as I can put it:
The issues with my computer are isolated to my machine only and were created by 3rd-party software I have installed. Neither the laptop hardware nor Apple software have the issues related to brightness controls as I had previously believed.
The tech media is always happy to jump on Apple. Let’s see if they report this story as “thoroughly” as they reported the original.