So... from the purely personal perspective of the author who quit: yes, realistically WFH isn't going to keep you alive. If it becomes a pandemic, eventually we're all going to get it. That's what pandemic means.

But straightforward management strategies like remote work still have value, because in a pandemic the problem just that everyone gets stick, it's that everyone gets sick at the same time. So... now you have to compare the mortality rate of a serious but normal flu infection when treated at a well-equipped hospital to the mortality rate of contracting COVID-19 in a city with effectively no hospital space available.

That's what we're trying to fix. And it's doable, but not if everyone (including, very frustratingly, our leaders) tries to pretend like nothing is wrong. If your office environment is plausibly exposed (and in the modern world of international geeks, almost all tech offices are), and you can WFH, you should WFH. Period.