It's all a bit of a mess isn't it?
I get what you're saying OP. The government has divided us into 3 groups:
1 - Extremely vulnerable people who should be shielding
2 - Vulnerable people who should be taking extra care
3 - The rest of us
A certain amount of very basic help from central government is being put in place for group 1 - food parcels where necessary, but also I think prescription deliveries and special arrangements for essential medical appointments.
Group 2 have been told to take extra care but there is no specific help in place. This group haven't been mentioned for a bit because the government wants them to still go to work.
Group 3 have the best chances of survival and the best chances of having only mild symptoms.
We need to be prioritising group 1 but after that group 2.
And also all the people who fall through the gaps. People in group 3 who live with someone in group 1 should not have to traipse round shops because of the risk they'll bring the virus home with them. Lone parents need to get groceries and if shops are saying no children then they will need help. People in group 3 with disabilities who are always reliant on home delivery still need it now. People with serious MH issues or LD or dementia etc. may not be able to comply with the social distancing measures and are likely to suffer a disproportionate level of mental distress ...
Supermarkets are not the Ministry of Food. They're not set up to handle this. All their systems are set up to maximise profit. The people who now need prioritising are not the biggest spenders generally. Supermarkets have had to turn their entire business model upside down and inside out and actually I'm impressed with their response, even though it is far from perfect in terms of meeting actual need.
I wish that everyone who is raging at sainsburys or ocado or whoever about the lack of delivery slots instead focused that energy on calling the government to account and insisting they take responsibility for making sure everyone has access to food and other necessities. We can't leave this to laissez-faire capitalism. We probably do need a ministry of food or at least a much more centrally coordinated response.
In the meantime anyone in group 3 who has no other particular reason for needing a home delivery shouldn't book one, even if the site says you can. Even if you've paid for a delivery pass. Even if you've had deliveries for years. Even if the government has said we must all stay at home. And if you've booked slots weeks in advance then the right thing to do now is to go back and cancel them. Nothing bad will happen to you if you don't do this but I will judge you in the time honoured MN tradition and my judgment is that you are a complete and utter fucking shit.