Another reason day old rice is better for fried rice is that it has a more concentrated flavor. When rice is fresh, it's like a blank canvas - it doesn't have much flavor of its own. But as it sits, the flavors of the rice start to develop and deepen, making it a more interesting base for your fried rice.
Blackstone Chicken Fried Rice easy Recipe in 33 mins
Think of it like a good wine - it only gets better with age. Okay, maybe that's a bit of an exaggeration, but you get the idea. The flavors in the rice have a chance to mellow out and become more complex, which makes for a more delicious fried rice dish.