Tarot cards can't just be used as a projective because of their history. They are associated with fortune telling.
Denying that is like walking around with a swastika armband telling anyone who calls you a nazi that it's got nothing to do with the Nazis. Even if you're a Buddhist you still have to accept there an association there.
That is the problem with tarot cards. Some people are going to think you are reading their fortune, no matter how much you preface it.
Tarot as fortune telling is only something I've seen used for entertainment purposes. In the clinical setting I've only seen them used as projectives.