Yeah it's easy to see what Miyamoto meant just by reading this thread. I also think that it's going to be a much more wider thing where we compare graphics across systems, and even across platforms. In this game, noticing the things that look really good (stadiums) makes the other things look mediocre at best (grass).
Ever been on, or seen up close, one of these fields in real life? The grass is about 2 millimeters tall, and mostly packed down into a sort of cushiony carpet like state. Doing it with a high resolution texture is actually much more accurate than what fifa is doing. The grass should be nowhere NEAR as tall as it is in fifa.