I used to work in manufacturing. One place used the Japanese standard of manufacturing with paper based progress gates and faxing copies to other sections. They also paid cash for any outside contracts. The whole system worked flawlessly. Those negatives are not as bad as they seem.
Pretty common in China too. I'd regularly make deposits and people would come in with cases of cash and deposit alongside the rest of us.
Sometimes they'd use the cash deposit ATMs, and the rest of us online would be like f****** okay just take 10 minutes there inserting stack after stack of cash. cool of you