I totally agree with this essay.
In Murakami Haruki's novel "Forest of Norway", the heroine says she can live well without learning trigonometric function. The male insists that it is meaningful to train a systematic way of thinking.
The specific 'content' of mathematics is important, but it is more important to learn 'thinking abilities' that is trained in learning the content.
I think I can apply the same story to philosophy.
In the age of the 4th Industrial Revolution, 'thinking abilities' is likely to become more important.