I agree with the article in general, but that said, I do think a lot of successful people are successful because they are highly opinionated in black-and-white ways. Coming across people like this in life can be frustrating whether they tend to be right or wrong. I've definitely known and worked with a few people who were black-and-white thinkers and abstracted away and ignored a lot of second order effects that could negate their opinion, but had such good intuition that they tended to be right anyway.
A good read on this is “The Cognitive Distortions of Founders” by Michael Dearing https://link.medium.com/Ri20AKKuL2.