You mention that hucksters peddle it for things that it's isn't useful for, but in what context is it useful? The realization that people have different ways of thinking, abilities and interest, which in turn means they are good at different kinds of work isn't the invention of the MBTI. Why does a 4-axis test help with this? Why should people take it seriously, especially considering it's highly commercialized?
Anyways, you're just missing my point. You just don't get what my point is for. You don't understand it either.
Like Astrology, Meyers-Briggs is a specific system of categorizing personality types with a lot of lore about how the types interacts. There is no evidence that MB is any better than astrology or the theory of humors or any other arbitrary categorization for this purpose.
Btw is your comment implying that only certain MBTI types are able to become musicians or pilots or engineers? Because that at lease a falsifiable statement which is quite interesting.
Yet, when somebody puts in work to systematize that understanding, you do. If you know a better way to organize the knowledge, publish that.
> evidence that MB is any better than astrology or the theory of humors
Better at what? Invariably whoever imagined they are debunking it shows how little predictive value it has about behavior, proving only that they have no conception of what it is for.
People have often imagined they were debunking astrology by showing that sun signs have no predictive value, and completely missing that the signs are purely a randomization device: if they had any predictive value, they would be a failure.
What it's good for is to help you understand how people who think differently than you do are often not wrong. Other people are super great at things you can't hardly do at all, for reasons. Putting people good at X doing Y instead is a formula for dissatisfaction for those putting and those put. People naturally try to sort themselves into work that they are good at, where how they think works best.
Great actors, pilots, artists, surgeons, musicians and engineers would mostly do one another's jobs very, very badly.
That is not to say there aren't hucksters peddling it for what it is useless for, but that is on the hucksters and their pigeons.