I think Amazon and covid (semi and full lockdowns, local shops closing etc) have exposed an idea that you touch on, decoupling the last mile shipping from amazo

I think Amazon and covid (semi and full lockdowns, local shops closing etc) have exposed an idea that you touch on, decoupling the last mile shipping from amazon/doordash/etc; a market/depots/etc for peered-powered distributed shipping/delivery. I would guess the bulk cost of shipping is the fist and last few miles.