Ranjit has brought up some great questions, and you don't need to answer them or let us know the answers. I kind of wonder what 'card tricks' or 'languages' have to do with piano playing however, but most of his other questions have some degree of merit.
I've never done card tricks, I can't juggle or speak another language but I can play the piano very well, since my mind likes puzzles. Working out the letter name vertically on the music as you make sense of the rhythm horizontally.
My main piece of advice would be to think of music like a language. Soak up all the detail on the piece and analyse everything on the page.
My concern about the original list of questions is that someone thinking of starting to learn to play an instrument, that if they said no to all or most of that list, might then think that they would fail, and therefore not go the route.
The reason for the question directed at the more senior and music teachers was designed to give me an impression that engaging in this new venture would not be ‘ that after about four or five years of steady practice, we would expect you to be very competent with some major Scales and possibly halfway through book Two for beginners.After being made known of this projected outcome, my desire to learn the piano would have changed significantly.
Encouragement ought be in the mind of those already possessing the appropriate skills, else we oldies may just sit back, not engage and wonder ‘ what if ‘.