Time not spent going out and buying food is more time I can spend with my friends, family and hobbies. If you spend 30 minutes per day on logistics of going out, buying, traveling, and coming back, then that's a full week per year.
Anyway you put it, the time savings does not provide a good ROI for the rest of the crap which follows a company like Uber flying a fleet of buzzing drones in an urban environment.
compared to a fleet of '95 civics in questionable repair roaming the streets all day, a bunch of small drones doesn't actually sound that bad. drones aren't actually that loud once they're ~100 ft in the air and DJI is making them quieter every year.
The real convince is to not need interact with people who aren’t of your social class.
/s