I think you are laboring under a slight misapprehension about personality research. Myers-Briggs isn't solid science. The eneagram isn't solid science. Astrological personality models aren't solid science. I think you have correctly noticed that "psychological traits" are a ripe area for epistemically unsound belief systems that appear to bear on something people hold near and dear (ie understanding other people) so you're justifiably suspicious of a mention of personality, which is laudable.
But you're asking for a defense of "all that crazy stuff", and a good defense of "all that crazy stuff" can't honestly be provided, because most of it really is bunk, or at least it has so much bunk mixed in that its only good for psychoceramic data or maybe to pan for gold that might be hiding in the crazy. The big five personality model is an attempt to do actual science in the same space in order to produce reasonably valid and reliable dimensions of human "personality" variation. The point of the big five is that there is solid research and a deep literature and so on, in contrast to all the crackpot stuff.
If someone uses the big five and you're suspicious and ask for a defense of personality systems in general, that's like someone using geometry and you being suspicious because you're only aware of a lot of crackpots who keep trying to square the circle and so you ask them to defend the squaring the circle stuff, (which was proved to be impossible in 1882) before you'll accept analysis of evidence that legitimately makes use of a "suspiciously geometric" concept like the triangle inequality.
Unfortunately, defending established science quickly is hard because the content of science generally involves real inferential distances. If you want to start reading in this area, two useful keywords are Psychometrics and Trait theory.
In practice, "Openness to new experience" is the weakest part of the big five personality model. It can be measured reliably and predicts various things you'd expect it to predict and relatively naturally falls out when you settle for using 5 dimensions rather than 3 dimensions or 18 dimensions. However, when researchers tried the same thing on other cultures to see if this was a human universal, it turned out that the other four (Extraversion, Conscientiousness, Agreeableness, and Neuroticism) were relatively universal but in some cultures (if I remember correctly it was things like agrarian peasant societies?) basically everyone is pretty low in Openness relative to measurement norms derived from Japan or the US or whatever.
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Just wondering, are you generally classified as INTP? I've noticed that people consistently put in one of the types are more likely to think that their type is real.
Like wedrifid, I test as an ENFP on online tests, but if I answer questions like I would have if I hadn't learned social skills, I come out as an INTP. The INTP profile I mentioned is freakily accurate, and not just in a horoscope type of way.