The problem with psychometric tests is that they're easy to game by answering them with the values the company is almost certainly looking for. Any company issuing a psychometric test is looking for obedience, hard work, discipline, profit orientation, civility, non-threatening creativity, etc. etc. etc.
So what you get by discouraging a broad diversity of personalities is a mix of people who actually have those specific characteristics and sociopaths. The latter group ends up running the company, and of course they issue utterly sociopathic "psychometric evaluations", which are basically just encoded discrimination against entire classes of people, regardless of job fitness, because the people up top are such incompetent leaders that they need subservient workers to obey their crazy orders without question.
So what you get by discouraging a broad diversity of personalities is a mix of people who actually have those specific characteristics and sociopaths. The latter group ends up running the company, and of course they issue utterly sociopathic "psychometric evaluations", which are basically just encoded discrimination against entire classes of people, regardless of job fitness, because the people up top are such incompetent leaders that they need subservient workers to obey their crazy orders without question.