Banks themselves can (like the main stores). But the end users are still using basic pins. Also, most banks have begun using ripple/xrp for intra-bank transfers. So there is also whatever vulnerabilities THAT has.
Beyond that… the banks are also compromised with H1B Chinese and indians, technocrats, and other insider threats to the point that I’m not sure any encryption will make them safe. Encryption doesn’t matter if you cannot trust the admins.
I do worry about BTC, don’t get me wrong. Long term, some new technology may make BTC simply too vulnerable to be useful, even if it isn’t current level quantum computing.