[renewiltord]

If they are truly life-necessary. But it is quite likely that the elderly and the pre-existing conditions folk will survive getting the bread tomorrow instead of in two hours.

We already have a bypass mechanisms for the "I'll die if I don't get it in two hours". It's the emergency services system and it's there when your life is in danger and it's currently overprovisioned to ensure capacity.

[vkou]

Which is why I was talking about grocery delivery as a whole, as opposed to two-hour grocery delivery.

The problem is if the express versus economy stratification does not actually increase overall system throughput - but instead, attracts more load to the system, as people who don't need it, but were otherwise going to the store end up using it for convenience.