https://www.ibm.com/think/topics/cash-vs-digital-payments
There is a lot of convenience, but its not convenient if you are locked out of the system.
Digital certainly makes sense for big transactions.
https://www.clearlypayments.com/blog/global-shift-from-cash-checks-to-digital-payments/
However, on a person to person or human level, cash isn't just nostalgic, its essential.
https://www.bis.org/statistics/payment_stats/commentary2301.htm
https://www.businessnewsdaily.com/15255-cash-free-society.html
