> I am kind of fascinated that there is so little call to do things like improve ventilation. There's some, but people haven't seemed to catch on that we could do things to reduce disease that cause ~no individual inconvenience.

Some countries are actually putting significant resources into this. But if you're in a country that isn't, well, realistically, who is going to pay for it? Public health experts pretty much everywhere are saying that it should be done (mind you, they were saying that before covid, too; "proper ventilation would be beneficial" is hardly a new idea), but the only way it happens is through state funding.