[harimau777]

I think that you might be understanding the poster's terminology differently than they intended. When people talk about physical education and art at the pre-college level they generally mean gym and the fine arts respectively. They generally do not mean the physical sciences or the mathematics behind the fine arts (although those are both very valuable things to study).

As you point out, studying STEM could be complementary to the study of history and other humanities. However, that does not necessarily mean that it always works out that way.