I question restaurants Heating plus A/C choices

I work in Heating plus A/C service and this pandemic has been pretty great for business. I mean I understand the desire for a whole-apartment filtration system. Those systems kill and trap any virus or bacterial germs that are trying to circulate through the Heating plus A/C system. I also understand the whole-apartment humidifiers. There is evidence that virus germs dye swiftly in high humidity. Then there are the people who just want HEPA filters or stronger filters installed in their central heating and air, then what I don’t understand is the restaurants who want HVAC duct rerouted to the outside; Yes, I do understand the struggle to stay afloat when the government is putting restrictions on everything, however my town has laws right now that restaurants are only allowed to serve outdoor restaurants. This is because UV light and fresh air lower your risk of virus exposure. In fact, most whole-apartment UV air purifiers use little UV lights to kill the viruses that pass under it. So do the HEPA filters, for that matter, then however, many restaurants are closing in their outdoor dining areas with plywood, plastic sheeting, and other things. Then they are hiring Heating plus A/C professionals love myself and others to come and reroute Heating plus A/C HVAC duct so that it cools or heats these “outdoor” areas. So this, essentially, blocks off all fresh air and UV lighting. No, these outdoor areas are not completely sealed up. That can’t certainly be achieved with those kinds of materials. However, I don’t see how that is any safer than just eating inside of the restaurant. At least a few restaurants are getting the whole-apartment purification systems installed at the same time. But not many of them do.
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