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Wait, why are we talking about 'essential' and 'key' workers / businesses at all then? It's more of a specific reduction of any business with direct people contact, everything else just goes ahead as usual. Reading what people are saying online e.g. on reddit, it also does not seem many businesses are taking a lot of precautions with regards to social distancing at work, disinfectants etc....
OK but did I misunderstand that the idea was for non-essential businesses that can't do wfh to shut down for the time being? Precisely to avoid having lots of people out and about that aren't really strictly necessary right now?