Prepared food delivery has a food-safety problem that raw-ingredient transport doesn’t: many orders combine hot components (a cooked main) and cold components (a salad, a dessert, a drink) in the same delivery, and both need to stay on the correct side of safe temperature the entire time they’re in transit — not just when they leave the kitchen or arrive at the door. Cold food delivery transport is built around that requirement, using vehicles or delivery bags with genuinely separate hot and cold compartments, each independently controlled.
This is a different problem from moving a box of chilled produce, which only needs to stay within one range. Prepared food transport has to manage two ranges simultaneously without letting either drift toward the middle.