Banks as an example of "getting things done" is laughable. Real industry gets things done: manufacturing, construction, healthcare etc. We could do without the massive leech that is the finance sector.
The banks' real "product" is trust. You will work an entire month for a "bank transfer" (something you can't even hold, let alone eat or burn) because you believe your landlord will similarly accept a "bank transfer" in exchange for you rent (or, if you have a mortgage, you work an entire month because you believe this means you will be able to continue living in your house unchallenged). This has absolutely nothing to do with what programming languages or paradigms they have in place.