Barleywine
Yes, seeing as Hermetic teaching and many Asian philosophies say that chance does not exist so maybe you are right. It's very interesting. According to Hermetic belief every action has a cause ad infinitum so even supposedly drawing a random card from a fan, can depend on things such as; the shape of the fan, how tired you are, what the light is like and infinite other (unknown) possibilities
Yes, as long as you get meaningful results it doesn't seem to matter. Whether or not it's repeatable for the same question is another story. But my experience has been that any two competent readers can get substantially the same answer from different cards, so "universal wisdom" would seem to be a pervasive phenomenon for those able to tap into it.