Have you tried Big 5 too?

Interesting article, but MBTI is not just contested, the concensus since the 90s is that MBTI is pseudoscience [1][2][3][4][5], so it's nearly 40 years.

Would have been interesting to test against the Big five instead !

[1] https://www.psychologytoday.com/us/blog/give-and-take/201309...

[2] https://web.archive.org/web/20061206025148/http://www.indian...

[3] https://journals.sagepub.com/doi/10.1177/014920639602200103

[4] https://aps.onlinelibrary.wiley.com/doi/10.1111/j.1742-9544....

[5] https://www.vox.com/2014/7/15/5881947/myers-briggs-personali...

Is that because they're trained on the navel gazing posts of reddit nerds?

I’d guess that is what you get for training them on source code.

Also the I vs E axis feels meaningless in this case.

The Elephant Rider model (or whatever similar childrens model of the mind so far developed - Plato's Chariot, Kahnemans System 1/System 2, Freuds id/ego/super ego, Hobbes Passions+ Reason, Hegels Master-Slave, Cherokee 2 wolves etc etc) is the 3 inch chimp brains attempt at recognizing it is not a single unitary system, but multiple layers. Those layers, and there are many more that what anyone is taught, are a requirement for the system to make predictions over different time horizons. Contradictions between those predictions requires stories for the system to stay coherent. Personality traits are one such story.