Sorry, but both Freud and Jung were mystics. Freud intellectualized a dalliance with his sister in law and Jung intellectualized everything else.
Jung was a mystic, of sorts. I don't think you can or should say that about Freud. Freud and Jung split over that very issue, with Freud saying point blank he not want to go where Jung was going, that he wanted to keep the study in the realm of Western science and not get 'mired in the black muck of the occult', or something to that direct effect he said. So no, Freud was not a mystic.
And if you believe that Jung "intellectualized everything else", then you haven't ever opened his Red Book for a look around. Jung had actual experience in these states of consciousness himself. That makes him opening directly with mystical states experientially, not intellectually.
To be clear, by mystic, I mean those who have mystical experiences, either through meditation, or other means. The mystic peers into the Deep in such states. This is beyond rationalism.
"Metaphysics" as I'm using the term means "foundation of science" and includes axioms, definitions, and experiment. It is not really "philosophy" though is usually treated as such. I believe that without understanding metaphysics it is impossible to understand either experimental results or the limits of one's own knowledge.
I think we are using the term much differently. While metaphysics is a huge topic in itself, as you can gather by just reading about it here in
this philosophy article from Stanford University, that term can be almost as bad as using the term "spiritual" or "soul" is. It is after all, dealing with things that include being 'beyond physics', into the nature of essence and being. It's that "beingness" and "suchness" or things like this, that I mean when using the term. It's big-picture stuff, beyond what the empirical sciences as such can penetrate.
That is where you move beyond rationality into the transrational, or mystical perceptive, granted one though various higher states of consciousness, which have been mapped out in many systems of study throughout Eastern systems, such as Buddhism, Hinduism, and such. The West sorely lacks that information, until more recently. That's what I mean and I referring to in using the term "mysticism".
"Knowledge" is mere book learning if you don't understand how it was discovered and its limitations. Most "science" reported by the popular press today is not science at all. Much of what is reported isn't even true and the little that is true contains numerous errors. Even the science journals contain endless errors of omission. "Theory" itself is sometimes questionable in metaphysical terms.
People believe things that are not true. When these beliefs include the omniscience of science we have "scientism". Some things can't even be studied scientifically but people still have "explanations" in the form of assumptions. We are almost wholly ignorant and nobody can predict the future yet everyone seems to know everything!!!
You and I are in agreement here. Our assumptions of reality are through our biased programming through culture and language. That is in fact what the mystical experience exposes us to, letting us see beyond that. It sees the illusion of all of it, and seeks instead to know the naked Truth.