Banks have long had tricks like giving robbers cash with an "exploding" ink packet inside - the criminal then has to deal with bills that are marked. Also banks have security cameras (that normally are operational), and silent alarms that ring the police station. In the end odds are anyone robbing a bank is caught, and even if you are not banks keep plenty of small bills on hand, so you get a bag full of money, but not a lot of real value inside the bag.

Stores don't generally have as much protection, but even then they never have a large amount of money on hand. Robbing a store and getting $300 isn't really worth the risk.

That's not a function of banning cash however, its on account of the rise of credit cards. No one sacrificed or was inconvenienced to get here, it was just natural progression with good side effects.