I see what you are saying.If the tracks are not parallel to the blade, then the fence is also not parallel to the blade. Since I spent $300 for a fancy fence for my Sears saw, I HAD to go check and see if it was parallel or not!
I was pleased to see that mine is parallel to the blade. :)
I don't think that my blade is moveable, but it has been a long time since I set it all up, so I may have forgotten. It is belt-driven.
I suppose that if this is an issue on an individual saw, then the directions for that saw will discuss it.