I think Tarot is a system meant to look into one's own subconscious through archetypes. Receiving a reading from someone would make more sense if they actually did "read" you rather than using a warm or cold read, or another confidence trick. But even if they can or do read you, or are literally psychic, having someone else read your cards is probably the least effective way to use something like Tarot. Yes you could do this with any arbitrary system. Sometimes people doodle or do other distracting thing as they intuit or think through things. Take for example 'reading the tea leaves.' It can simply be an arbitrary canvas which is a tool to project upon. There may be other levels, I am merely a fellow traveller, but maybe this is something the average person can use.