Is the big improvement with a belt over a chain thought to be the reduced need for maintenance, or is there something else I'm missing? I understand why people get excited about shaft drive, even though it seems doomed to inferiority. This is just old wine in new bottles. Chain, toothed belt.....not really a huge difference, it would seem? Or are there cool things you can do with a belt driven system that you can't do (or as easily) with a chain? Are they better for CVTs?