I wish this article hit on an important point: when should the persistent quit? We all know we should know when to hold and when to fold, but in practice that's a hard decision to make especially when we're invested. And someone who is "persistent" vs "obstinate" should be able to do this: quit when it's right to do so. The closest thing he mentions is this, "persistence often requires that one change one's mind. Tha…
There is a book that addresses this question: Quit by Annie Duke