I don't agree with this. In one document you might have aligned your objects using visual bounding boxes, to a grid of 1/8", whereas in another document you might have aligned the center of your paths to a 5 mm grid. In another document, you might have designed icons on the pixel level with a pixel grid. This is all very different for various workflows or projects. If these snap and grid settings are not remembered per document, then for every document you open you would first need to zoom in, figure out what has been used for alignment and at what pitch, try to find out where the origin of the grid was (if that was not at 0,0), and re-apply the grid and snap settings. This is not a good idea, because it's cumbersome and error prone.