I think that agile ignores human psychology. First, in management theory, intrising motivation happen when one has autonomy, mastery and purpose. Imo, plus accountability. Agile removes that from individual, but has some rhetoric that places it on the "team". But team is not person, it is set of people.
Second, it kind of assumes that people are socially perfect and everyone is kinda the same and its answer to any social human problem is "that is team dynamic or bad individual". It does not help to deal with predictable human imperfections, emotions and conflicts.