The correct answer to this open question is the following.
The opinion of the author Mary Frances Berry is that indeed it is very difficult to change the Constitution through amendments. Specifically, she wanted to modify the Constitution regarding the principle of equal rights for men and women, but she couldn't. Although she felt disappointed for not having the chance to change it, she considers that it is positive that the Constitution cannot be easily changed. She considers that article V of the Constitution, which refers to the amendments, it's very strict and clear about it. That is why the founding fathers and the framers of the United States Constitution decided to maintain stability in the government and in the country.
Mary Francis Berry wrote her article for the New York Times on September 13, 1987.