I definitely thought about my comment a lot, since I am in a technical role. I recognize it's arrogant, but let me provide some insights.
We are currently facing threats from "online only" banks, where you can sign up and use a bank account without ever talking to a person or stepping foot in a building. This is a threat because banks make their money on transactions and if everyone goes to the cool smartphone app bank, what will our bank have left?
We'll be left cashing cheques for blue collar workers. We'll be left doing phone support for geriatrics. We'll be left giving loans to refugees. We'll be left with safety deposit boxes. We'll be left with all of the unprofitable parts of the banking market that the online only banks say NO to.
And that's where that 80% of our staff comes from. Branches and call centers to manage the small, unprofitable sector of the consumer banking market. To my point, our bank has a long running project to shut down branches across the country. We realized that profitable customers only come to the bank to sign papers, and unprofitable ones come to harass the bank staff.
There are staff needed for good governance and to manage regulations, but those staff do not make up the bulk of our labour.