One big issue with society that would be completely cashless is that it will essentially grant ability for foreign governments to control people in different countries. There is an on-going case in Finland where Boris Rotenberg (allegedly someone who is in inner circles of Russia's leadership) is in OFAC sanctions list due to Crimea occupation, but he also has Finnish citizenship and he's not in EU's sanctions list. Due to being on OFAC list Finnish banks are refusing to accept payments coming from his Finnish account in fear of US actions (including fines and sanctions against the banks).
If you are not even allowed to do things in cash (and to be honest, it's pretty close to that in Finland already), you would also need to disallow banks from blocking transactions that are not breaking local laws. Otherwise in the worst case you are making it so that foreign governments have power to force people to commit crimes (like being unable to pay taxes since bank refuses to move the money).
If you are not even allowed to do things in cash (and to be honest, it's pretty close to that in Finland already), you would also need to disallow banks from blocking transactions that are not breaking local laws. Otherwise in the worst case you are making it so that foreign governments have power to force people to commit crimes (like being unable to pay taxes since bank refuses to move the money).