Rogerian therapy views the patient as the 'expert' of their own condition, and encourages them to arrive at their own solutions with the help of the therapist
Concepts in humanism such as self-actualisation and congruence are untestable and subjective, which does little to improve the scientific credibility of psychology
Maslow's ideas of self-actualisation and congruence may be more readily accepted in Western, individualist cultures compared to Eastern, collectivist cultures