The problem with that is that the more custom options there are, the less likely it would be in the magic order. If your delivery service doesn't carry garlic butter sauce, then you couldn't deliver the right product. If the ingredient isn't real, and just on there to make the right order, then we would see things like "Dominos has Garlic butter sauce" on the menu but never delivers it. Like a McDonalds soft serve. Sure, the machine is there, but it's always broken."
This of course does nothing to explain the millions of people employed as delivery drivers who would have to go down, select the victim, stuff them into a red bag, and carry that weight to the door. And now days, leave at the door. No contact delivery and all.