The final decision on who to hire never comes down to who is the ‘most qualified’. There will almost always be multiple people who are qualified and the tiebreaker is interpersonal stuff like a matching sense of humor, attractiveness, and not reminding the interviewer of someone they don’t like.
Someone might be told it is based on the most qualified, but working well with others is part of a job and not in the written qualifications. It is also a subjective determination and varies wildly depending on the job and who is interviewing.