The first article had some incorrect statements. Long-term trends were foreshortened, maturing in days and even hours, instead of weeks or months. This is just incorrect. No, because they keep changing. Think about it.
Markets are the same because they always change.
The key is to trade a system that responds to change. But, if you have a basic philosophy that's sound, you can take advantage of those changes to make money by capturing the bulk of a trend. It is the same with using good, sound business principles, the changing world is not going to materially hurt you if your principles are designed to adapt. This is precisely why Turtle trading has continued to work for all these years. There are a few theories as to why a gifted trader like Henry didn't tinker with his trading program when it was striking out.