Yeah, sure, delusional. Until you call a local polititian “so 1 dick” on some online platform, leading to you and also your ex grilfriend getting raided by the police, all electronic devices taken by them as evidence for an undetermined time and the low key threats from the prosecutor about what would happen next. Or until a journalist dares to link to a website, that the state recently criminalized the creators of, though the state itself links to that specific site, too. And depending on how easy the access for the police is: You might wanna refrain from being too popular (like a famous singer or actor) or from being active against climate change or right wing extremism. Your personal data is easily leaked through the police to anyone of their friends.
You might think, that this is overly specific and won’t really happen? Well, it already did. In germany. Sure, most people won’t have the states crosshair on their forehead. But nontheless you might easily be one of the exceptions.
Though having cash is not enough. The stores also need to be able to accept cash without internet usage. I think we had a case in germany a few years ago, where some supermarkets could not sell anything, because the servers, to which the local payment system connected (also uses for cash) didn’t work. Not sure, if that was because of a security incident.