Because routing is not a simple problem. Uber/Lyft pull it off because the car is in the "neighborhood" but deliveries need to have fixed hours in unpredictable

Because routing is not a simple problem. Uber/Lyft pull it off because the car is in the "neighborhood" but deliveries need to have fixed hours in unpredictable conditions like traffic, people etc. Add to preferred time to the mix and the whole thing becomes even more untenable.