We have "click 'n' collect" at supermarkets in UK - but you have to book slots to use it at supermarkets and there are no slots available for 3-4 weeks anywhere close to me (for example) - all booked up. Don't even think about home deliveries. So the concept is great but already capacity is overstretched as soon as restaurants closed down.
The real issue round the area I live is that some basics are just unobtainable. There has been no flour or bread available to deliver for example for 2 weeks despite rationing by supermarkets/retailers and major flour producers increasing production massively. So if you hadn't stocked up, if you couldn;t or didn;t want to expose yourself to risks going out to hunt around 4-5 stores for one bag you would now be without any sort of bread to eat. You also can't bake your own without flour. Other basic food and baking items are the same and even seeds to grow your own vegetables are getting almost impossible to buy, boxing people into a trap to having to queue and shop over weeks.
It's a chicken and egg situation - at the start people were asked not to "panic buy". But even after people pretty much finished panic buying and rationing came in the shelves are still empty of those basic staple items. People are asked to trust that there is enough food in the system. I am sure there is, but rather like medical PPE there is simply no logistical capability to get certain items where the demand is so people can access them. Had hoped by now this would be stabilizing, but it is clearly not. These failures to adapt systems and supplies are at the root of the pressures driving people out of their homes, especially people with larger families or trying to shop for others. It is not just the logistics of distributing PPE that is essential to keeping the virus spread contained, it is equally if not even more so the need to effectively distribute supplies to the public to decrease their needs to go out.