Well, that is well on your single data point, here is mine: I live in a bad weather prone area of the united states. I do not know _anyone_ that does _not_ have a meaningful amount of cash in the house for bad weather. Yes, stores here operate with low/no power or communications and use cash. I agree with the poster who noted that it provides a localized resilience. It is your fault, not anyone else's, that you do not have some currency.
Truth be told, I have kept about a weeks worth of spending in cash for decades in the house, just in case, and I have indeed had to use it during long term power outages. Heck, in my area just last week, all of my banks ATMs were down for the entire week due to a software issue after an upgrade (I am not making this up). While I might not have needed cash, it shows the fragility of our systems we rely on.