This was a bit before the model of having Uber driver type delivery though. I am guessing that having the deliverers be close to the deliverees make it more economical to keep them in stores until a larger scale is reached. The dark store+ model was also predicated on a more factory floor like environment with only FTEs present. Think pallets moving about among the pickers- not too hard to work around IMHO but maybe the lawyers and insurers feel differently.

I still feel the overreaching factor is that in dense urban centers there is no cheap commercial/industrial space that is also in close proximity to customers.