Space is the main reason. We live in the city and the amount of organic waste we (family of 4 + numerous pets) produce is staggering. additionally meat attracts animals. This I run an overnight cycle and I can add it to my compost heap and let it degrade more and no issues with rodents and other animals who dig through food waste. after using this device, in the future I would always grind/break up my organic waste as fine as possible just to save space.