Jungian psychology is outdated and disproven pseudoscience that uses unscientific and crank methods to determine personality traits. For example, the personality types quiz will categorize you as an emotional or rational person, throwing out the possibility of a person being both out with the bathwater. Especially when you consider that recent studies into empathy, emotions, and intelligence are actually deeply linked and you cannot have one without the other.

A Buzzfeed 'which bread are you' quiz is also an inventory of questions about your behavior but I don't see anyone using it to decide what job I should have

That's not what they're saying. It's a reductive measure that turns people into 16 categories, some of which are disproportionately selected against in jobs.

I can do the same job as someone who scores differently, but an interviewer can use it as an excuse to exclude me. A lot of other ND people feel similarly.

Then throw in the arbitrary history, most people can't even say what the mbti actually measures.

It's got too much influence for something that can't actually predict about a person, especially if they can change just lie to get a favorable score. It just puts more work on people.

It doesn't when you don't even get consistent results from the same person over multiple tests

You'll answer questions differently at different times of day and on different days of the week, all dependent on personal variables that are in constant flux. You're a different personality type before and after a nap, for example. It's nonsense.