Why are oil ballpoint pens so hard to write and so ugly to write?

Why are oil ballpoint pens so difficult to write, so ugly to write, but so popular?
Today, I suddenly realized that ballpoint pens are used for alphabetical writing, not suitable for such strokes as Chinese characters, Japanese, Korean and so on.

Many people write a lot of English, but not in the way Latin alphabet users have been trained since childhood, or in Chinese, so no matter how they write, what kind of pen they use, they are very uncomfortable. But I’m watching Xu…full text