Technologists have to understand business economics. They must be able to evaluate ROI and quantify risk. But to be really successful in the highest sense, they also have to understand that life is about people. You retain more customers when they're treated as people. You get better deals with suppliers when they're treated as people.
Employees deliver better when they're treated as people.
People have likes and dislikes. They need approval and validation. Their moods change. They have pictures in their heads of who they really are and who they'd like to be. Technology functions in this human landscape of personality and irrationality.