Earlier quoted context omitted.
> No because those flu viruses were not novel, or as deadly. That information always lags reality. When/if the next deadly flu strain emerges, it will have emerged before it is discovered to have emerged. If you're not planning for this scenario, are you really planning for the worst case? You could be Patient Zero for Spanish Flu Part Two, with your preemptive masking being the difference between global disaster and…
We started masks when it became clear the Covid was far more contagious and deadly than the flu.
We started wearing masks because covid actually existed, not because we feared that it might one day exist. Fear of hypothetical future covid strains is an example of the later, not the former. I'll consider fearing them once they actually exist, just like those hypothetical future flu strains.