1. This article combines vague connections between chess, Indian philosophy, chemistry, life advice, quantum, etc. While I support the author in writing about whatever they feel like, there is a question what the upvoters on HN see in this.

2. If we're discussing the title... the reason people "underestimate" causality is because they've tried to use it a few times, been really wrong and learned not to do that again because a rational person doesn't trust their own ability to reason causally. See also; chess. It is really hard to assign causality in a 40 move game with a relatively limited number of choices each move. Assigning causality in reality is even harder. Getting it right is a very specialist skill.