I don't see how anyone can take a deck as a tabula rasa unless it's full of blank cards. The artwork speaks quite loudly for itself, as it should. I think that those who swear by reading all of Crowley's writings in order to read with the Thoth deck are missing the point of a tarot deck. The images should carry the message intended. If not, it's not a deck worth using, IMO. I read books associated with all my decks, if there are books, and I find that I get valuable information from them. But they can't possibly encompass all that the images on the cards do. Most authors/creators of tarot decks and books are quick to point this out. Was Crowley that far different in his approach to reading tarot that he would insist on using his book meanings? I don't see how most of his book meanings could be taken at all literally in a reading about someone living today, and I don't memorize book meanings for any deck I use. I wouldn't call myself a reader if I did that.
Most of what I get from deck creators (Crowley or anyone else) is help identifying objects and figures in the images and why those were considered appropriate symbols for those cards. What is that faint outline of a building? Oh, it's Solomon's temple. Why would that be in a tarot card? And so forth. Yes, the Book of Thoth is helpful with this. But not nearly as helpful as books by other writers who aren't so cryptic as Crowley. Much of what's in his book is also ON THE CARDS. The astrological correspondences, many of the more obvious symbols, colors, etc.
As to intuitive reading, Crowley claimed visions and inspirations himself. Am I supposed to trust only his intuition and not mine? I wouldn't be much of a reader if I didn't trust my ability to get a message from the lay of the cards. I'm not a Thelemite, nor do I follow any other religion when reading the cards. I'm a tarot reader.