If you are going to do an investigation of this sort, is it not best to start with an open mind? Also, to do some research before you begin.
Your opening paragraph reveals your preconceptions and prejudices. A good Tarot reader would not claim that the cards predict the future, and would say something along the lines that a reading offers insights into the personality and life of the querent. In any case, suppose a reading could predict the future, you start from the position of assuming this not to be the case, thus a closed mind. Perhaps Tarot has survived because people find readings genuinely helpful, and not because they are naive and gullible. Your reader, Julie, says some very reasonable things in this regard.
What is wrong with symbolism? Why are you prejudiced against it — “overburdened” reveals your attitude. What is wrong with being strange and dream-like? I suggest that what you really mean here is irrational, which is what makes you feel uncomfortable.
Your historical account is very interesting, but is also full of your preconceptions and biases.
It was no surprise that you got round to the idea of cold-reading and confirmation bias. At no point do you seem to consider that the possibility that a reading might be real and meaningful. Tarot readers are either “well-meaning but credulous, or cynical and exploitative”.
Julie’s approach during your reading was not helpful. Asking for clarification and guidance can only lead to an impression of cold reading. When I give a reading, I insist that nothing is said until it is completed. Then some discussion can be entered into about how helpful and relevant it was, and whether anything further can be added.
I have written about the Tarot in an earlier Medium article. If you have the time, it might hopefully open your mind:
