The Short Version
Mainstream research psychology broadly regards the MBTI as lacking strong scientific validity, a position anchored by the APA's own assessment that it has "little credibility among research psychologists" and a 2025 systematic review finding 50% of participants receive different type results on retesting. The claim's absolute framing slightly overstates the case: some MBTI subscales show acceptable reliability in certain studies, and the sharpest criticisms target the forced binary "type" categorization rather than every psychometric property of the instrument.