I'm not sure where you live. I work in a fast-food place on a college campus. While the students generally use their meal-plans to buy food, the moment we have a "parents' weekend" or similar event, we do a lot of cash.
It is generally poorer people (who don't have access to banks) who have to use cash (or resort to alternative banking systems that charge exorbitant fees).
[0] https://www.cashmatters.org/blog/right-pay-cash-now-protecte...
Tangential: I'm surprised that no one complains about these things. Google Search has become unbearable and Amazon is obviously bad these days. There's no way people aren't getting annoyed by the tech they use every day, yet you're right, no complaints.
It's almost always a silicon valley bubble
In Australia I haven't bothered to take any cash out in about a year, many businesses don't accept cash, and everything still seems to function just fine.