Earlier quoted context omitted.
Uber Eats has done this to me and it made me stopped using them. Driver needs to wait for the second meal to be prepared, pack it together, take a detour to the other place and spend time delivering it. So your meal arrives late, cold, and crushed after you paid full-price for the delivery.
> Driver needs to wait for the second meal to be prepared, That's the rub right there. If you're the winner in the market, can send info to a restaurant to keep your food hot (or even hotter than normal) and can schedule it perfectly it will work. Once you spend a couple of billions into the infrastructure to make it happen, you can totally make a couple of hundred thousands worth of profit - 2020 Startups.
I'm not sure what exactly you think restaurants can do with that request. A small subset of places will have a heat lamp, but that still doesn't really preserve quality, just heat.