As others of said leftover white rice is dryer once it has been in the refrigerator overnight. This allows for fried rice to be separate when cooked the next day. Using fresh rice will result in a mushy fried rice with broken kernels which is not desirable for fried rice.
My parents owned an Chinese restaurant for 30 years, before they retired, and they had a lot of leftover white rice each night so it was never an issue. If there is not enough for fried rice the next day then they will explicitly make more white rice just to put in the cooler for use the next day.
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