FWIW, my office building was quite transparent about the fact that pre-pandemic, there were 1.5-2 ACH, well below the recommended 3-6 for reduction of Covid spr

FWIW, my office building was quite transparent about the fact that pre-pandemic, there were 1.5-2 ACH, well below the recommended 3-6 for reduction of Covid spread. They have since upgraded/reconfigured the HVAC for 4 ACH. Two of my previous offices didn’t have building-wide HVAC at all, relying on local units without configurable access to fresh air. This doesn’t invalidate your point, just highlighting that perhaps many office buildings are not up to the levels of air turnover needed without real investment.