> It surprised me that people define theirselves via their CV: “Who are you?” -> “Here is what I have done in my professional life!”. Anything weird about that? I wouldn't expect my potential employer to be interested in my family, hobbies or beliefs. So I would respond with job-related stuff as well.
In Europe people tend to care more about these things because they're interested in creating a good healthy workplace. If you only wrote about your professional achievements, it would be a sign that your lack of a personality could cause problems within the workplace.
Everyone is different and there is no one-size-fits-all thing here that works for every country / job opportunity.