I'll also add that accuracy on the present-you-don't-know (but will be revealed in the future or can be revealed or utilized) is way more helpful than a prediction on the future.
The way I read (the longest I've ever read is 6 months out; if I have my way, I prefer to keep it 1-3 months), most of my predictions for the future are really already present predictions. Thing is, the Sitter just isn't in the position to know everything from their position. So, if we can validate it enough to where the Sitter trusts and can utilize that information, I find it quite empowering.
That's why the Past is so important. Without the Past as a reference point, nothing in the Future makes much sense, I think. I don't channel or anything... I read cards and energies, and those things need context, in my opinion. So, "past" accuracy is everything in many ways, and that's one place I'd especially agree with the original quote from firemaiden.
Also, the more I think of it... the more I think there is no "Present" in a reading. What we call the Present is the very Recent Past and the very Near Future touching, as at Present, the Sitter is getting a Tarot reading, and so there's not much to read on that.
I asked the Tarot today, "What am I doing, right this moment, in the Present," and it gave me The Wheel of Fortune. To me, that seemed accurate.