Agreed. About 15 years ago I worked alongside a developer who worked like this. He was a very good engineer (not some savant as in the parent's example, but arguably the best in the organization when his mind was right). His mania had people convincing themselves he was a great engineer, like a black turtleneck and bravado convinced some that Elizabeth Holmes was Steve Jobs 2.0.

Unfortunately, he carried substance abuse and relationship issues with him as well, and eventually his health deteriorated.

When I reflect back, I realize nobody could relate to him because he was ill and needed help. Not because he was smarter or more capable than everyone else.