1. When you're preparing the sauce, you'd probably find that the sauce is very salty. But once it's mixed with the noodles which are wet from the cooking, the sauce will be diluted. Hence if you start off with an ok-tasting sauce, by the time you mix it in your noodles, the taste would be bland.
2. Chicken cabbage soup can be served with rice as a complete meal as well if you don't want to prepare the noodles.