I'm not yet a kooky GD 'fellow', but I do find myself intrigued by what the Thoth offers.
It is a shame that some (few) people's desire to glean further knowledge of things associated with tarot may prompt them to denigrate their earlier learnings, and, in doing so, inadvertently offend others... I don't really think that many students of Thoth suddenly become Tarot snobs, and feel in any way superior... Some may, it is true, but as someone else noted, there can be a tendency towards superiority in any field of study...
GD, Thoth or RWT, TdeM or other... does it really matter which school of thought or body of knowledge one chooses to pursue, just as long as one school, or many, speak their message to us clearly enough that our readings may be beneficial to others?
I enjoy the knowledge I am gaining of the Kabbalah, and the most wondrous Tree of Life, something which has intrigued me for many years. I haven't yet grasped the significance of many Astrological associations, or of many other things, but, bit by bit, as I read and re-read, more information seeps in...
Much of it I will never remember, because I don't have a high-performance memory... but that is ok, as I really do prefer to read intuitively... This new information just adds to whatever store is buried deep in my memory banks, and either will or won't make itself available when certain symbols arise in a reading, and just may add that extra level to my understanding.... and then again, it may not!
Symbols simply prompt my intuition... I have found that, in any given moment, if my intuition is to prove useful, only the most pertinent aspects of the card will come forward into my focus anyway, so.......
I love the RWT... it was my first deck, and feels comfortable and familiar to me, much like an old friend. The Thoth is not so comforting, as, yes, Frieda's artwork is less aesthetically appealing to me, in truth... But it does intrigue me, and encourages me to delve more deeply in order to understand what those symbols actually refer to... RWT is an old friend. Thoth is a new one, that I'm still becoming better acquainted with. I believe there is room for many such friends in my life... I haven't shaken hands with TdeM yet... perhaps another day....
"Is this stuff necessary"??? I'm too new as a student of this deck to feel confident answering that question, except to say that, as someone who is prompted by intuition, I'm more comfortable throwing any limiting factors to the ether and allowing myself to simply sit and be with the card, and the querant, whilst opening myself up to what comes through for that person, in that moment. If all "this stuff" helps, good... If it hinders, not good.... So... necessary, probably not... helpful, probably