Well exactly, delivery drivers, council workers, broadband, water, gas, electricity, everyone involved in the supermarket supply chain, police officers, emergency service workers, bus drivers, train drivers, tube drivers, journalists, prison staff etc etc
After lockdown it will be teachers, nursery workers, shop staff, those who work in manufacturing, warehousing, the court system, road maintenance, cleaning staff, etc
The economy has to start to function at something approaching normality. Some people will be able to stay at home and they will be able to do so because others are choosing not to and are keeping society ticking over.
If everyone just said, no way, I’ll stay in until there is a vaccine thanks! The country would collapse within days. Once new case numbers are down and the R level can be kept low using track and trace and some limited ongoing social distancing the risks to the majority will not be significant.
Obviously if you have a very high individual risk profile that will need to be considered on a case by case basis.