Your statement that "mbti is based on supposition without any reality testing with evidence" constitutes a factual assertion that can be reality tested and proven false by contrary evidence.
Anyone who's interested can find quite a lot of such contrary evidence described or cited in the long two-part post that starts
here.
As one example,
here's a large-sample 2003 study that summed up the MBTI's relative standing in the personality type field this way:
...and the authors went on to describe the results of their own 11,000-subject study, which they specifically noted were inconsistent with the notion that the MBTI was somehow of "lower psychometric quality" than Big Five (
aka FFM) tests. They said:
The MBTI has "a very firm empirical foundation," and is psychometrically "on a par" with the leading Big Five tests. So concludeth Robert Harvey, a hearty subscriber to the Enlightenment. Would you like an
introduction?
RJ Harvey (Ph.D. Industrial/Organizational Psychology, Ohio State, 1982) has taught at Virginia Tech since 1987. As author of the Common-Metric Questionnaire (CMQ), the preeminent standardized job analysis survey, he has been active in research on job/occupational analysis and assessment topics related to employee selection and competency modeling. In recent years, he has been a vocal critic of the Department of Labor's plans to replace the Dictionary of Occupational Titles (DOT) with the O*NET on philosophical, legal-defensibility, and psychometric grounds. His current research programs focus on developing a defensible, job-related occupational analysis system suitable for replacing the failed O*NET, using job-component validation (JCV) to link the domains of job work-dimensions and worker personal-traits, and developing faking-resistant assessments of non-cognitive (personality) traits.
But alas, Mole, it sounds like you've been seduced by a vainglorious fantasy in which you play the role of enlightened savior, crusading to rescue the "damaged psyches" of a host of forumites who've been deluded into "reveling in a false world devoid of integrity."
And that fantasy "plays to your desires and your vanity" (to borrow your words), and prevents you from seeing that it represents "a whole false psychological world."
And "the cost," as you aptly put it, "is your integrity."