I think LRichard is correct in saying not necessarily, but not because of anything having to do with the Thoth, but with the RWS. The Thoth is often said to have a lifetime of study in it, very deep, etc., but the same thing can be said for the RWS. The RWS is not a beginner's deck, it isn't simple or simplistic, it shouldn't be disparaged as "easy." It has, at its base, the same structure as the Thoth, much of the same symbolism, attributions, study and meditation potential... an entire world, really. The difference is that the occult knowledge in it is hidden, so it is perceived to be simpler, as most people choose to simply ignore what the Thoth makes it that much harder to ignore. If one classifies the Thoth as difficult one should do the same with the RWS.
If one reads intuitively by the pictures alone, or by simply learning card meanings by heart, there is no difference between the decks, and one could read with anything. For that matter, reading intuitively makes it so there is barely any difference between Tarot and oracles.
The difference between the RWS and the Thoth is in what they say, their overall philosophy and message, although they both use exactly the same language to say it.
