Speaking of lacking competence...
I wonder what happened to DMS. He's a guy that I knew in school. When he landed a job, we all predicted that he'd be shooting himself in the foot before long. He had some technical competence but very poor social skills. What's more, he was basically a "plug and chug" kinda guy when it came to solving physics-related problems. He could study and he could score well, but he didn't necessarily have a very solid grasp of the underlying science principles.
Then there's Deborah, someone that I worked with at a charity. She had competence, but she was also severely lacking in people skills. She said that she was a people person who simply chose not to act like one. That was a blatant excuse for bad behavior, and she never admitted that to herself.