Yes, an unknown known may be a psychological protection mechanism.

I’m not sure your analogy of the building is correct. Walking into an unknown building is a known unknown, you know you don’t know the place. How that makes you feel, I believe is more dependent on character than intellect.

For me religion is a delusion. We don’t know the nature of the Universe or how it was created. I am comfortable not knowing, but for some that causes anxiety. Religion is a an early attempt at creating certainty where there is none. As our knowledge increases the role of religion will diminish, but it can never be removed as it is impossible to know everything inside a system without going outside of it. The Universe is a system we can never escape.

What prompted this post is I now think technical analysis, or “TA” is an unknown known. It is a thing traders know, but is wrong.

i.e. there is a huge amount of defined and well understood analysis you can do on candle charts, and there is consensus on how to do this, but the end result is simply that a trader is more confident about predicting an unknowable future price.