Busses work, though. If you removed busses, there is no amount of Ubers you could add to the roads to "fix" the system. It's clearly impractical for each office worker to pay for even half an hour of someone's time every day to deliver a meal just to them. While most counter services can serve 20 meals with the same half hour of wages.

Uber Eats is doing it here in London with "ghost kitchens". 15 fast casual brands cooking (mostly reheating really) from 3 kitchens in 1 building. A much better chance for delivery drivers to be able to pick up multiple orders. It still isn't enough optimising though, as the destinations are still scattered.