I definitely hear his argument about opportunity costs, and in terms of dollars and time (particularly human effort), I agree we should be focusing on the most

I definitely hear his argument about opportunity costs, and in terms of dollars and time (particularly human effort), I agree we should be focusing on the most important efforts to combat COVID. It's the most critical threat right now, so it's more important to spend time and money on ventilation solutions than more bleach. On the other hand, some of this is disinfection that should have been happening already and will hopefully cut down on the spread of other diseases. Just as a practical example, my wife's school has not had a single outbreak of norovirus in over a year thanks to obsessive surface-cleaning and hand-washing, and that stuff spreads like wildfire. It's not (usually) a fatal disease, but it does result in hours of lost time for everyone involved annually. Food poisoning cases, hepatitis transmission, and things like RSV are all hampered by better surface sanitation, so it's not just a tummy-bug problem. In the places where we can develop better automated sanitation solutions, that's a good side benefit—especially if we can turn around and spread those more universally.